What does "underpants" mean?

Underwear covering the genitalia and often buttocks, usually going no higher than the navel.

What is a synonym for "underpants"?

Common synonyms include: boxers, briefs, drawers, pair of briefs, pair of drawers, pair of knickers.

Pronounced //ˈʌndə(ɹ)ˌpænts//.

//ˈʌndə(ɹ)ˌpænts// noun

noun ·Uncommon ·Advanced level

Noun

1
Underwear covering the genitalia and often buttocks, usually going no higher than the navel. plural, plural-only
"The Italian fashion of wearing red underpants on December 31 is becoming popular, reputedly to guarantee luck for the new year."
2
an undergarment that covers the body from the waist no further than to the thighs; usually worn next to the skin wordnet