短衬裤 — meaning in English

English meaning

• breech noun The back part of a gun barrel, where the ammunition is loaded, behind the firing chamber.
• breeches noun Trousers that end at or just below the knee, historically menswear, now mostly seen in riding and formal military dress.
• drawers noun Underwear worn on the legs, especially loose-fitting undergarments.
• panties noun Underpants worn by women and girls.

Senses

短衬裤 is used for these senses in English:

• breech (historical, now only, _, in the plural, or, attributive) A garment whose purpose is to cover or clothe the buttocks. [from 11th c.]
• breeches (historical) A garment worn by men, covering the hips and thighs; smallclothes.
• drawers (dated, or, regional, informal) Underpants, especially long underpants.
• panties Underpants for women and girls.

breech — full definition

1. noun The back part of a gun barrel, where the ammunition is loaded, behind the firing chamber.
2. noun Used to describe a baby positioned to be born bottom- or feet-first instead of head-first.