(informal) To cease to be idle and start working.
Stop playing computer games, and get busy with your homework.
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(slang, idiomatic) To have sex.
The couple were getting busy in the front room when the doorbell rang.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.