(idiomatic) An act of bias or a tactic for cheating which creates a situation that unfairly benefits one party involved in an interaction.

Alternative spelling of kerthump

(engineering) A nut with a knurled rim which can be turned with thumb and forefinger. / Synonym of wingnut

plural of thumbnut

plural of thumb ring

A ring worn over the end of the thumb to protect it during archery.

plural of thumb-a-war

plural of thumb wrestle

plural of thumb war

A thumb war.