1. verb To act or perform in a conspicuously ostentatious or showy manner in order to gain the attention of others. Our son always likes to show off when we have guests over. Yes, we know you're a good dribbler, but you don't have to show off so much during the game.

2. verb To display a person, thing, or ability of which one is very proud, perhaps as a means of seeking attention. In this usage, a noun or pronoun can be used between "show" and "off." The couple has been going around to friends and family members showing off their new baby girl. I've lost a lot of weight over the winter, and I'm looking forward to showing my new body off at the beach this summer. My dad never misses an opportunity to show off his skills on the piano.

3. noun Someone who acts or performs in a conspicuously ostentatious or showy manner in order to gain the attention of others. As a noun, the phrase is usually hyphenated or spelled as one word. Our son becomes a bit of a showoff when we have guests over. Yes, we know you're a good dribbler, but don't be such a showoff during the game.