in short trousers
English
Etymology
From an early 20th century practice of reserving short pants only for small children.
Prepositional phrase
- (idiomatic) In childhood; as a child; when quite young (including nonliterally, e.g., as a young adult).
- Synonym: in short pants (especially North America)
- Near-synonym: in diapers
- We didn't have computers or mobile phones back when I was in short trousers!