Double-V is V + top-down V = X
Great Dictator Imitation of XCross-XCross
displaying Victory sign like British ChurchIll?
double-Xcross on upper left arm
Sasha Baren Cohen
double-Xcross symbol in background top left
To break a promise in a way that harms the person with whom the deal was originally struck. To double-cross is to back-stab and to two-time. Also, double-crossing can be merely 'ratting' someone out.
to cheat or betray
the act or an instance of double-crossing; betrayal
A deliberate betrayal; violation of a promise or obligation, as in They had planned a double cross, intending to keep all of the money for themselves. This usage broadens the term's earlier sense in sports gambling, where it alluded to the duplicity of a contestant who breaks his word after illicitly promising to lose. Both usages gave rise to the verb double-cross.