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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
    "The teammates exchanged a quick knuckle bump before the game";
    - fist bump [informal]

Derived forms: knuckle bumps

Encyclopedia: Knuckle bump