Foreign Phrases in English: Clear Everyday Guide
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Ad hoc describes an arrangement created for a single immediate purpose rather than a permanent system. De facto describes a reality that exists in daily practice whether or not it has official legal status or formal recognition. Déjà vu can mean a feeling that a new moment has happened before, or figuratively a situation that seems familiar or repetitive. A faux pas is an embarrassing social blunder that violates polite conventions. Per se means by itself or strictly considered alone.
The manager organized an ad hoc committee to address the water leak.