How to Say "collar stays" in Spanish
The Spanish word for “collar stays” is “ballenas” — B2 level.
English → SpanishB2
nounB2
plastic or metal inserts for shirt collars

Examples
Perdí las ballenas de mi camisa favorita.
I lost the collar stays of my favorite shirt.
Antiguamente, los corsés llevaban ballenas de verdad.
In the old days, corsets contained real whalebones.
Context is Key
If you are at a dry cleaner or a tailor, 'ballenas' refers to clothing parts, not sea animals.
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