por si las moscas

just in case (colloquial)

Conditionals & Hypotheses

Notes & Usage:

Conditional/hypothetical expression

Por si las moscas, todo sería diferente.

Just in case (colloquial), everything would be different.

Llévate un paraguas, por si las moscas.

Take an umbrella, just in case.

—¿Confirmaste la reserva? —Sí, por si las moscas, dos veces.

—Did you confirm the reservation? —Yes, just in case, twice.

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