There are 2 definitions of show off in English:

show off1

informal Make a deliberate or pretentious display of one’s abilities or accomplishments.
More example sentences
  • She's worried about making friends and constantly makes up stories about herself and shows off to get attention.
  • Sometimes I'd tease my older students about having boyfriends, or get the younger boys to behave by telling them that they should stop showing off to impress their girlfriends, and quickly everyone would fall in line.
Synonyms
behave affectedly, put on airs, put on an act, swagger around, swank, strut, strike an attitude, posture; draw attention to oneself
informal cop an attitude
See parent entry: show

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Pronunciation: fɪˌɔːrɪˈt(j)ʊərə
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There are 2 definitions of show off in English:

show-off2

Syllabification: show-off

noun

informal
A person who acts pretentiously or who publicly parades themselves, their possessions, or their accomplishments.
More example sentences
  • My arts degree days were essentially high school with more complicated essay questions, featuring the usual parade of show-offs and kiss-asses, vain and lazy professors, and some good people too.
  • Irwin also remarked on a gallery practice that has occasionally allowed show-offs to pretend they own something that they have no intention of paying for.
  • Some reviewers have recoiled in horror from the film, denouncing von Trier as a misogynist, a fake, a show-off, an incompetent director, and worse.
Synonyms
exhibitionist, extrovert, poser, poseur, peacock, swaggerer, self-publicist, braggart
informal showboat, blowhard, grandstander

Definition of show off in: