A large hook on a pole for catching fish, or (British slang) a person's home; can also mean to catch something with a gaff.
From Old French 'gaffe' meaning 'hook,' possibly from Old Norse origins. The fishing tool meaning is primary; British slang 'gaff' for home emerged later in the 1800s.
The same word describes both a fishing hook and your apartment, which seems random until you consider that 'gaff' might once have meant any useful hanging device—language loves to repurpose practical tools as slang.
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