a small insect typically having a sting and living in a complex social colony with one or more breeding queens. It is wingless except for fertile adults, which form large mating swarms, and is proverbial for its industriousness.
Family Formicidae, order Hymenoptera: several subfamilies
Family Formicidae, order Hymenoptera: several subfamilies
have ants in one's pants
informal be fidgety or restless:what’s the matter with you, always fidgeting—you got ants in your pants?
