flatter UK /ˈflætə/US /ˈflætɚ/verb 6noun 5forms 5 verb6 •To compliment someone, often (but not necessarily) insincerely and sometimes to win favour.A man that flattereth his neighbour spreadeth a net for his feet. — 1611 •To enhance or gratify someone's vanity by praising them. •To encourage or cheer someone with (usually false) hope. •[with oneself] To cheer or please (with the idea that); congratulate oneself, especially when the perception is false.Before the results came out, I flattered myself that I had done well on the test. It turned out I was the worst in the class! •To portray someone to advantage.Her portrait flatters her. •[with oneself] (no longer used) In phrasal verb "to flatter with": to encourage, inspire with hope. noun5 •(UK, slang) Someone who lives in a rented flat. •Someone who flattens, purposely or accidentally. Also flattener. •A type of set tool used by blacksmiths. •A flat-faced fulling hammer. •A drawplate with a narrow, rectangular orifice, for drawing flat strips such as watch springs. formsflattered · flattering · flattereth · flatters · flatterest