to have passion or furore underneath a calm expression
a placid exterior covering a something that can be dangerous
external calm does not mean that the situation is safe since there may be a danger under the water
a quiet person may have deep feelings or an interesting personality when one gets to know them
Though he rarely speaks in class, still waters run deep.
She did not talk to me that day and I knew that something is wrong, still waters run deep.
He didn’t express his opinion in the meeting but still waters run deep.
You’re usually shy so I did not expect you had so much to say. I guess still waters run deep.
You should not talk with that gang, they’re too quiet and still waters can run deep.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.