n. 25B6; noun
he sat on the floor : GROUND, flooring.
the second floor : STOREY, level, deck, tier.
25B6; verb
he floored his attacker : KNOCK DOWN, knock over, bring down, fell, prostrate; informal lay out.
(informal) the question floored him : BAFFLE, defeat, confound, perplex, puzzle, nonplus, mystify; informal beat, flummox, stump, fox, make someone scratch their head; N. Amer. informal buffalo; archaic pose.