Definition of "sapping" [sapping]

• Present participle of sap. (verb)

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• "He did not protest beyond presently a transient frown as at a bad taste on his tongue, and a rather petulant objection to her use of analogies, which he called the sapping of language."
• "And when once on the downward slope, chronic innutrition is an important factor in sapping vitality and hastening the descent."
• "I’ve heard brain sapping can be a painful experience."