什么是 tart?Having a sharp pungent taste; sour. See Synonyms at sour.Sharp or bitter in tone or meaning; cutting.A pastry shell with shallow sides, no top crust, and any of various fillings.Chiefly British A pie.A prostitute.A woman considered to be sexually promiscuous.Chiefly British To dress up or make fancy in a tawdry, garish way. Often used with up.