Definition of "caving" [caving]

• The recreational sport of exploring caves. (noun)
• Present participle of cave. (verb)

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• "I had such a _caving in_ here "-- putting his hands up to his side --" I had such a _desperate caving in_ here, that I thought I should die."
• "It seems that the telephone companies were complicit in caving in to the NSA, giving them what they wanted, without first going through the courts."
• "I sense a certain caving-in of hope in America that problems of race can be solved."