IPA: /ˈnʌtˌkrækər/
KK: /ˈnʌtˌkrækər/
A tool used to break open the hard shell of nuts so that the edible part inside can be eaten.
She used a nutcracker to open the walnuts for the pie.
Nutcracker → It is formed from "nut" (from Old English *cyning*, meaning a hard-shelled fruit) and "cracker" (from the verb "crack" which means to break). The word "nutcracker" refers to a tool designed to break open the hard shell of a nut.
Think of a tool that 'breaks' ('cracker') the hard shell of a 'nut' — that's why a nutcracker is used to open nuts.