Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Noun: knuckle bump
Usage: informal
  1. A gesture performed when two people each form a closed fist with one hand and then lightly tap the front of their fists together, similar in meaning to a handshake or high-five
    - fist bump [informal]

Derived forms: knuckle bumps

Encyclopedia: Knuckle bump