noun
undies
UHN-dees
noun
1
A casual, informal word for underwear.
"She threw her undies in with the rest of the laundry."
How to Use Undies
Learner’s notesIn plain EnglishA casual, everyday word for underwear.
When to use it
Informal — fine in casual conversation, but "underwear" is more neutral for formal contexts.
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Etymology
A shortening of underwear with the informal -ie/-y ending added.