noun
A gesture of greeting or celebration in which two people lightly tap their closed fists together
verb
To engage in the act of performing a fist bump
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The two colleagues greeted each other with a professional fist bump before the meeting.
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Let's celebrate our success with a fist bump!
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He gave me a fist bump to show that we were on the same page.
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The agreement between the two parties was sealed with a figurative fist bump.