gatecrash - definition and synonyms

verb [intransitive/transitive] 

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/ˈɡeɪtˌkræʃ/
present tense
I/you/we/theygatecrash
he/she/itgatecrashes
present participlegatecrashing
past tensegatecrashed
past participlegatecrashed
  1. to go to a party or other social event although you have not been invited

derived word

gatecrasher

noun [countable]
singulargatecrasher
pluralgatecrashers