tart UK /tɑːt/US /tɑɹt/adjective 3verb 3noun 4forms 5phrases 1 adjective3 •Sharp to the taste; acid; sour.I ate a very tart apple. •High or too high in acidity. •(figurative) Sharp; keen; severe.He gave me a very tart reply. verb3 •(informal, disapproving) To dress garishly, ostentatiously, whorishly, or sluttily. •(informal, disapproving) To practice prostitution. •(informal, disapproving) To practice promiscuous sex. noun4 •A type of small open pie, or piece of pastry, now typically containing jelly (US) / jam (UK) or conserve, or sometimes other fillings (chocolate, custard, egg, butter, historically even meat or other savory fillings). •(slang, offensive) A prostitute. •(slang, offensive) Any woman with loose sexual morals.We know the majority of the places that these tarts will hang out at. — 1950 •A melt (block of wax for use in a tart burner). formstarted · tarting · tarts · tarter · tartest Phrases with tart tart upTo dress so as to be more sexually attractive, especially with make-up and revealing clothing.