FLAT definition in American English | Collins English Dictionary
https://www.collinsdictionary.com/us/dictionary/english/flat
WEB3 days ago · 1. adjective. Something that is flat is level, smooth, or even, rather than sloping, curved, or uneven. Tiles can be fixed to any surface as long as it's flat, firm and dry. ...windows which a thief can reach from a drainpipe or flat roof. 2. adjective. Flat means horizontal and not upright. Two men near him threw themselves flat.
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