stair S2 W3 /steə $ ster/ noun
[Language: Old English; Origin: stæger]

1. stairs [plural] a set of steps built for going from one level of a building to another ⇒ upstairs, downstairs
up/down the stairs
Jerry ran up the stairs.
the top/head of the stairs
I left my briefcase at the top of the stairs.
the bottom/foot of the stairs
‘Lisa,’ he cried from the foot of the stairs.
We walked up four flights of stairs (=sets of stairs).

2. [countable] one of the steps in a set of stairs:
Lucy sat down on the bottom stair.

3. [singular] literary a staircase

4. below stairs British English old-fashioned in the servants’ part of a large house, in the past

[TahlilGaran] Dictionary of Contemporary English ▲

stair
noun
I. stairs steps inside a building
ADJ. steep | wide | narrow | rickety | main | back
QUANT. flight We went up three flights of stairs.
VERB + STAIR ascend, climb, go/run, etc. up, mount | descend, go/run, etc. down | take, use Take the back stairs.
STAIR + VERB lead to sth | creak
STAIR + NOUN rod The carpet was held in place by brass stair rods.
gate
PREP. under the ~ a cupboard under the stairs
~ (down/up) to the stairs to the third floor
PHRASES the bottom/foot/head/top of the stairs, take the stairs two, etc. at a time He rushed up to the bedroom, taking the stairs two at a time.

[TahlilGaran] Collocations Dictionary ▲

stair
II. one step
ADJ. top | bottom
STAIR + VERB creak The third stair creaked as I stepped on it.
PREP. on/the a ~ He sat waiting on the bottom stair.

[TahlilGaran] Collocations Dictionary ▲