[ shad-oh-boks ]
/ ˈʃæd oʊˌbɒks /

verb (used without object)

to make the motions of attack and defense, as in boxing, as a training or conditioning procedure.
to evade or avoid direct or decisive action.

Origin of shadowbox

First recorded in 1915–20; shadow + box2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for shadowbox