1.verbTo exhibit the best attributes of something.
"Grocery stores show off their produce by placing the most attractive specimens in front."
2.verbTo attract attention to for the purpose of bragging or personal exhibitionism; to demonstrate a skill, talent or property for the purpose of bragging or personal exhibitionism.
"She loves to show off her driving prowess."
3.nounOne who shows off.
"Quit being such a show-off, before someone gets hurt."