TART is validvalid

having a sharp, sour taste [adj TARTER, TARTEST] : TARTLY [adv], TARTNESS [n] / to dress up [v TARTED, TARTING, TARTS]

4,787 of 196,601 in NWL2023·also valid in CSW24

sharp tasting [adj TARTER, TARTEST, TARTLY] / to smarten up [v -ED, -ING, -S]