There was a moment in early 2020 when one of the oldest pieces of social choreography in the Western world suddenly stopped working. A hand came forward and the other person hesitated. Someone laughed, withdrew, waved, touched an elbow, offered a foot, or produced the compact closed fist that had spent decades living in a very different social register.

The fist bump was not new. Long before COVID-19 it belonged comfortably to sport, friendship, youth culture and celebratory ritual. It could communicate solidarity without the ceremony of a handshake. Precisely because it was relaxed, it was useful. Precisely because it was relaxed, however, it could look out of place in the office, the clinic, the conference room or the first encounter between two professionals.

Then the pandemic disrupted the hierarchy of greetings.

The most interesting story is therefore not that people began bumping fists. It is that the fist bump became socially intelligible in situations where, only a short time earlier, it might have seemed unserious. COVID supplied a justification powerful enough to override etiquette: infection control. Once that happened, an informal gesture acquired institutional permission.

1. Before COVID, the fist bump had a status problem

Research published before the pandemic already suggested that fist bumps could reduce some forms of microbial transfer compared with handshakes. A 2013 pilot study in a hospital setting argued that the smaller contact area and shorter contact time of a fist bump could make it a useful alternative. A 2014 experimental study likewise found substantially less bacterial transfer during fist bumps and high-fives than during handshakes.

But hygiene was only half the question. Greetings are cultural objects. They communicate age, distance, rank, warmth, professionalism and belonging. An epidemiologically attractive greeting can still fail if people think it looks ridiculous.

A later infection-prevention paper discussing the fist-bump proposal captured the resistance vividly. In a survey of infection-control practitioners, respondents worried that fist bumps were culturally incongruent, “too American,” associated with youth or street culture, potentially aggressive, and—most importantly for this argument—unprofessional. The problem was not whether two knuckles could touch. It was what those knuckles seemed to say.

The old social coding

The handshake carried institutional weight. It opened interviews, concluded deals, welcomed clients and marked introductions. It was conventional enough to disappear into the background. The fist bump did the opposite: it announced style. Using one could imply friendliness, informality, camaraderie or self-conscious coolness. That made it expressive, but it also limited where it could safely be used.

2. Then the handshake became a problem

In March 2020, the meaning of refusing a handshake changed almost overnight. What could previously have read as coldness or disrespect could now read as responsibility. Newspapers documented officials, clinicians and ordinary people improvising alternatives: waves, bows, elbow bumps, foot taps and other deliberately contact-reduced greetings.

This reversal matters. Etiquette normally rewards predictability. COVID made the predictable action—taking somebody’s outstretched hand—the questionable one. Suddenly every encounter contained a tiny negotiation. Do we touch? Do we not? Which replacement gesture do we both understand?

Researchers studying real-world greetings during the pandemic described exactly this process: routine tactile greetings became hesitant, suspended, refused or replaced, while newer practices such as elbow and foot bumps gradually became normalised. Social customs did not vanish. They adapted.

The fist bump had a major advantage in this chaotic market of alternatives. Unlike a foot tap, it did not require balance. Unlike an elbow bump, it did not require two people to angle their bodies awkwardly. Unlike a wave, it retained a moment of reciprocal touch. It was already widely understood. COVID did not need to invent a new gesture; it needed to reclassify an existing one.

3. The professionalisation of an informal gesture

Calling the result “formal” needs precision. No etiquette authority issued a decree announcing that the fist bump now belonged beside the handshake. The transformation was softer and more interesting: its range expanded.

A greeting that once risked appearing too casual became acceptable between people who were not intimate friends. It could appear at work, at public events, in medical contexts and between people meeting for the first time. The health rationale supplied legitimacy, and repeated use supplied familiarity. Once a gesture can be performed between relative strangers without requiring an explanation, it has crossed an important social boundary.

This is how customs often change. First comes exception: “We are doing this because circumstances are unusual.” Then repetition. Then shared understanding. Eventually the explanatory sentence disappears.

The fist bump also solved an emotional problem. A pandemic greeting needed to communicate caution without communicating rejection. A person could decline the open palm yet still offer something. The bump therefore said two things at once: I am maintaining a boundary, and I am still acknowledging you.

4. What COVID left behind

The handshake survived. So did hugs, cheek kisses and the countless other rituals people suspended or modified. The pandemic did not produce a permanent one-gesture replacement, and research on infection transmission remains more nuanced than the simple claim that a fist bump is always “safe.” A 2020 study involving MRSA, for example, did not find a significant reduction with a traditional fist bump compared with a handshake, although a modified low-contact bump did reduce transfer.

But the cultural change does not require the fist bump to have medically defeated the handshake. Its importance is sociological. The pandemic widened the set of gestures that could perform seriousness and respect.

Before 2020, a fist bump in a formal encounter could be interpreted as deliberately casual. After 2020, the same gesture could be interpreted as considerate, hygienic, efficient or simply normal. It retained its friendly character while losing some of its social risk.

That is the lasting transformation. COVID did not turn the fist bump into a bow or a business handshake. It did something subtler: it gave an informal greeting a professional passport.

The gesture stayed the same. Its jurisdiction changed.