mossback(redirected from mossbacks)
Also found in: Dictionary, Thesaurus.
slang An old, curmudgeonly person who is stubborn and resistant to change. Ah, don't be such an old mossback—technology is going to keep changing and evolving, and you're going to get left behind if you don't embrace it now.
n. an old square; a stick in the mud. Walter, you are such an old mossback.