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Tener la mosca detrás de la oreja

To smell a rat / To be suspicious

Idioms & Sayings
Notes & Usage:

Literally 'to have a fly behind the ear'. Describes an instinctive feeling that something isn't right, even without clear evidence.

See It in Context

Algo me dijo que no era de fiar. Tenía la mosca detrás de la oreja.

Something told me he wasn't trustworthy. I smelled a rat.

—¿Qué te parece su oferta? —Tengo la mosca detrás de la oreja.

—What do you think of his offer? —I smell a rat.

Desde el principio tuvo la mosca detrás de la oreja con ese negocio.

From the start she smelled a rat about that business.