noun

stair

stair, step

Be careful on the top stair.

Be careful on the top stair.

He sat on the bottom stair.

He sat on the bottom stair.

a/the stair a single step in a flight of stairs Be careful on the top stair.

Synonyms: step, tread

From Old English 'stǣger' (something to climb), related to 'stīgan' (to climb).

Imagine you 'stare' at each 'stair' as you climb. It's one of the individual steps. The plural 'stairs' refers to the whole flight.

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