'Not worth a cress' definitions:

Definition of 'Not worth a cress'

From: GCIDE

Cress \Cress\ (kr[e^]s), n.; pl. Cresses (kr[e^]s"[e^]z). [OE. ces, cresse, kers, kerse, AS. cresse, cerse; akin to D. kers, G. kresse, Dan. karse, Sw. krasse, and possibly also to OHG. chresan to creep.] (Bot.) A plant of various species, chiefly cruciferous. The leaves have a moderately pungent taste, and are used as a salad and antiscorbutic. [1913 Webster]
Note: The garden cress, called also peppergrass, is the Lepidium sativum; the water cress is the {Nasturtium officinale}. Various other plants are sometimes called cresses. [1913 Webster]
To strip the brook with mantling cresses spread. --Goldsmith. [1913 Webster]
Bitter cress. See under Bitter.
Not worth a cress, or {"not worth a kers."} a common old proverb, now turned into the meaningless "not worth a curse." --Skeat. [1913 Webster]