Is it ensure, insure, or assure?
1590s, from Spanish embargo "seizure, embargo," noun of action from embargar "restrain impede," from Vulgar Latin *imbarricare, from in- "into, upon" (see in- (2)) + *barra (see bar (n.1)). As a verb, from 1640s. Related: Embargoed.
A governmental restriction on trade for political purposes. The objective is to put pressure on other governments by prohibiting exports to or imports from those countries.