won't wash
Will not stand up to examination, is unconvincing, will not work, as in That excuse about your sick aunt just won't wash. This expression originally alluded to a fabric that would not stand up to washing but by the late 1800s was used figuratively for other kinds of failure.
Words nearby won't wash
womyn,
won,
won ton,
won't,
won't hear of,
won't wash,
wonder,
wonder boy,
wonder child,
wonder drug,
wonder-stricken