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1. To strike and dent something. That rogue shopping cart banged in the passenger side door of my car.
2. To score a goal. Their goalie made the initial save, but our trailing defenseman banged in the rebound.
bang in (sick)
To inform one's employer that one will be absent due to illness (real or feigned). That virus has totally decimated my staff—only two people are in the office today because the rest banged in sick! If you really want to go to the beach tomorrow, just bang in.
bang something in
to crush something; to dent or collapse something. Who banged the side of the washing machine in? Who banged in the side of the washing machine?
See bang in sick