The touching of elbows between two people, sometimes as an alternative to a handshake or fist bump when attempting to avoid the spread of germs.

To touch elbows with another person as a greeting, as a substitute for shaking hands, for instance during a pandemic.

simple past tense and past participle of bump elbows

present participle of bump elbows

To hit one's fists together.

simple past tense and past participle of fist bump

present participle of fist bump

The hitting together of two people's fists, as a greeting or in celebration of an accomplishment.

(computer graphics) Rendered using bump mapping.

(UK) A hard hat. / (US) A form of baseball cap.