# undies

/ˈʌndiz/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/undies
Updated: 2026-05-19

## Definition

a casual word for underwear. You use it when talking about your clothes in a friendly or informal way.

For teachers: a colloquial term for underwear.

## Examples

- I need to wash my undies before the trip.
- He asked his wife to bring a fresh pair of undies for the long flight.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.