EXAMPLES FROM THE WEB FOR STAIRS
At the head of the stairs they parted, Milbrey joining the lady who had waited for him.
He took his uncle up in his strong arms, and moved toward the stairs.
What I hear at night is the creaking of stairs, when I know that nobody ought to be stirring.
Grace hastened down the stairs, with her friend at her heels.
He swept up the blankets and went down the stairs to the first floor.
He accompanied her to the foot of the stairs and lit her candle.
Slipping her arm about Evelyn, Grace drew her toward the stairs.
Hester begged Mrs. Baldwin to lead the way, and followed her up the stairs.
Christine sat on the stairs outside, frightened and helpless.
At the foot of the stairs, Schwitter pulled himself together.
Old English stæger "flight of steps," also "a single step," from Proto-Germanic *staigri (cf. Old Norse and Old Frisian stiga, Middle Dutch stighen, Old High German stigan, German steigen, Gothic steigan "to go up, ascend;" Old English stigan "to climb, go;" German Steig "path," Old English stig "narrow path"), from PIE *steigh- "go, rise, stride, step, walk" (cf. Greek steikhein "to go, march in order," stikhos "row, line, rank, verse;" Sanskrit stighnoti "mounts, rises, steps;" Old Church Slavonic stignati "to overtake," stigna "place;" Lithuanian staiga "suddenly;" Old Irish tiagaim "I walk;" Welsh taith "going, walk, way").
Originally also a collective plural; stairs developed by late 14c. OED says stair still is ordinary in Scotland where flight of stairs would be used elsewhere.