verb

move slowly and carefully in order to avoid being heard or noticed.

he crept downstairs, hardly making any noise

crawl,move on all fours,move on hands and knees,pull oneself,inch,edge,slither,slide,squirm,wriggle,writhe,worm,worm one’s way,insinuate oneself,sneak,steal,slip,slink,sidle,skulk,pad,prowl,tiptoe,pussyfoot,soft-shoe,tread warily,move stealthily,move furtively,move unnoticed,walk quietly