desplegar
/despleˈɡaɾ/ · B2 · verb
to unfold
🚩 des- (undo) + plegar (fold) = un-fold; troops unfold across a field
Des- reverses an action and plegar means to fold, so desplegar is literally to un-fold. English deploy comes from the same Latin root plicare (to fold), via French déployer. Opening a flag or spreading out troops both count.