the.com/pocket knife

means A small folding knife with one or more blades that tuck into a handle, designed to be carried safely in a pocket.

from From 'pocket' (a small bag or pouch, itself from Anglo-Norman 'poket/pokete,' a diminutive of 'poke,' meaning sack) plus 'knife,' from Old English 'cnif,' likely borrowed from Old Norse 'knifr.' Folding knives small enough for everyday carry are ancient — examples survive from Iron Age Europe — but the compound term 'pocket knife' itself is a straightforward 17th-century English coinage, naming the blade by where it lived: not at your belt like a dagger, not in the kitchen, but riding quietly in your pocket until an apple, a splinter, or a stubborn knot needed attention.