staircase noun
ADJ. steep | broad, wide | narrow | elegant, grand, great | rickety | curving, spiral, sweeping, twisting, winding | moving | main | outside | back
VERB + STAIRCASE ascend, climb, go/run, etc. up, mount | descend, go/run, etc. down | use
STAIRCASE + VERB lead to sth The spiral staircase led to an upper gallery.
PREP. on the ~ They passed each other on the staircase.
PHRASES the bottom/foot/head/top of the staircase
You can also check other dicts: staircase (English, 中文解释 ), wordnet sense, Collins Definition