Simple past tense and past participle of sap.(verb)
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Use "sapped" in a sentence
"But I think all the years of camping in Girl Guides, with my parents, and then with some super granola boyfriends have kind of sapped me of my camping spirit."
"I’d studied the report, memorized its key phrases, enjoying the way the legalistic terms sapped the color from what had happened."
"I was his elder by half a year, and "sapped" very hard, while he laboured little; so that it will be plain at a glance, although he never acknowledged it, that he was the better endowed of the two with natural ability."