gatecrasher Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. someone who enters a party or event without an invitation Example Sentence He was a gatecrasher at the wedding. Synonyms intruder; party crasher; uninvited guest Antonyms guest; invitee Hear It! Say It! Write It! gatecrasher Switch to cursive Start Share with your friends: