have been sapping
-he estado debilitando
Present perfect progressiveconjugation ofsap.There are other translations for this conjugation.

sap

And then there's Kathleen with her birth-control pills which, although Kathleen disclaims it, must surely have been sapping away at least a fraction of her reproductive capacity.
Y luego está Kathleen con sus píldoras anticonceptivas que, por más que lo niegue, seguro que han estado minando al menos una fracción de su capacidad reproductora.
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