IPA: /ˈʃædoʊˌbɒks/
KK: /ˈʃædoʊˌbɑks/
To practice fighting by moving your arms and legs as if you are fighting an opponent who is not there, often done for exercise or training.
He likes to shadowbox in front of the mirror to improve his technique.
Shadowbox → It is formed from "shadow" (from Old English *sceadu*, meaning shade or darkness) and "box" (from Old French *boce*, meaning a container or enclosure). The word "shadowbox" refers to the act of boxing in the air, as if fighting a shadow, often used in training.
Imagine boxing against a 'shadow' — that's why shadowboxing means practicing your moves in the air.
No commonly confused words.