sapping
['sæpɪŋ]
v.
逐渐削弱（某人[某事物]的力量、活力等）( sap的现在分词 );
逐渐消耗（某人的力量、活力等）;
近迫作业;
下切;
例句:
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Lack of planning is sapping the company's efficiency.
缺乏计划正在削弱公司的效率.
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Tighter credit conditions are sapping already feeble demand.
紧缩的信贷让本就无力的需求更加乏力.
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Stop sapping her confidence!
别动摇她的信心!
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These other countries are just sapping our strength.
来自VOA
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He saw some big fellows sapping up a group of little kids.
来自L. Armstrong
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Opportunities for him to shine were rare but he can be pleased with his efforts in strength-sapping conditions.
来自BBC