GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Sap, v. t. [imp. & p. p. Sapped (?); p. pr. & vb. n. Sapping.] [F. saper (cf. Sp. zapar, It. zapare), fr. sape a sort of scythe, LL. sappa a sort of mattock.]
   1. To subvert by digging or wearing away; to mine; to undermine; to destroy the foundation of.
   
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   Nor safe their dwellings were, for sapped by floods,
   
   Their houses fell upon their household gods. Dryden.
   
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   2. (Mil.) To pierce with saps.
   
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   3. To make unstable or infirm; to unsettle; to weaken.
   
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   Ring out the grief that saps the mind. Tennyson.
   
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