underpants
n. A1 Beginner US //ˈəndɝˌpænts// UK //ˌʌndəpˈɑːnts// un·der·pants
n. the clothes you wear under your trousers or skirt to cover your private parts.
n. undergarments worn to cover the genital area and provide support to the lower body.
He forgot to put on his underpants this morning.
The store sells a wide variety of underpants made from soft cotton for all ages.
While some cultures prefer traditional styles, modern underpants are often designed for maximum comfort and breathability during physical activity.
From under- + pants.