run deep

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run deep (third-person singular simple present runs deep, present participle running deep, simple past ran deep, past participle run deep)

1. (informal, figuratively) Of a feeling, belief, or problem, to be very intense, serious, and firmly established, often existing for a long time.
2. (American football, Canadian football) Synonym of go deep.
3. Used other than figuratively or idiomatically: see run,‎ deep.

   still waters run deep

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