shortpants
nounUK /ˈʃɔːt.pænts/
US /ˈʃɔːrt.pænts/
Short pants are pants that end above the knee.
He wore shortpants to the park on a hot day.
OTHER MEANINGS
2. A young child, especially one too small to wear long trousers.
The little shortpants ran across the yard.
3. Informal term for a childish or immature person.
Don't act like such a shortpants about losing the game.
4. Pants that are cut short for sports or swimming.
He packed his shortpants for the swim meet.