IPA: //ˈkrɔsˌpiːs//
KK: /ˈkrɔsˌpis/
A horizontal or cross member that connects two parts of a structure or object.
The carpenter installed a crosspiece to strengthen the frame of the door.
Crosspiece → It is formed from "cross" (from Old English "cros", meaning a structure or object shaped like a cross) and "piece" (from Old French "piece", meaning a part or fragment). The word "crosspiece" refers to a part that is shaped like a cross or serves as a connecting piece in a structure.
Think of a 'cross' shape and a 'piece' that connects or supports something — that's what a crosspiece is.
No commonly confused words.