cut to the quick

The phrase "cut to the quick" is an idiomatic expression that refers to a deep emotional wound or hurt. It suggests that someone's feelings have been profoundly affected or hurt, causing intense pain or sensitivity. It can also imply an immediate, direct, and deeply felt reaction to a particular situation or comment. The phrase originates from the practice of nail trimming, where the "quick" refers to the sensitive part of the nail bed. Therefore, "cutting to the quick" suggests hitting a sensitive spot or vulnerability within a person.