stair UK /stɛə/US /stɛɚ/noun 2forms 1phrases 2 noun2 •A single step in a staircase. •A series of steps; a staircase.Yesterday, upon the stair / I met a man who wasn’t there / He wasn’t there again today / I wish, I wish he’d go away … — 1899 formsstairs Phrases with stair come down in stair rodsTo rain heavily in long streaks. missing stairA member of a community who is widely but privately known within that community for abusiveness or other harmful behavior that has not been addressed.