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/Sounds like "seh" (as in "set") + "REH" (as in "red") + "noh" (as in "note")/

Meaning

The nighttime moisture in the air that Latin American folk belief says can make you sick if you go outside with wet hair. Whether it's real or not, generations of abuelas swear by it.

Examples

Don't go out with wet hair, the night air will make you sick.

My mom always blamed the night air for any cold I caught.

Word family
Regional synonyms

Stay alert, pay attention, or be ready to act. In Colombia, Ecuador, Venezuela, and Peru, "pilas" is a direct warning or instruction to sharpen up before something important happens. Literally "batteries": having your batteries charged means being switched on and aware.