to seize and hold (a position, office, power, etc.) by force or without legal right

The pretender tried to usurp the throne.

to use without authority or right; employ wrongfully

The magazine usurped copyrighted material.

to commit forcible or illegal seizure of an office, power, etc.; encroach.

verb

give in , relinquish , surrender

verb

accroach , annex , appropriate , arrogate , assume , barge in * , butt in * , clap hands on , commandeer , cut out , displace , elbow in , get hands on , grab , grab hold of , highjack * , infringe upon , lay hold of , muscle in , preempt , seize , squeeze in , supplant , swipe , take , work in , worm in , wrest , steal