The Collaborative International Dictionary of English v.0.48:
gatecrash \gate"crash`\ v. t. To enter uninvited into a party or other social event. Syn: intrude, barge in, crash, gate-crash, irrupt. [WordNet 1.5]WordNet (r) 3.0 (2006):
gate-crash v 1: enter uninvited; informal; "let's crash the party!" [syn: barge in, crash, gate-crash]