'Sapped' definitions:

Definition of 'Sapped'

From: GCIDE

Sap \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. [1913 Webster]
Nor safe their dwellings were, for sapped by floods, Their houses fell upon their household gods. --Dryden. [1913 Webster]
2. (Mil.) To pierce with saps. [1913 Webster]
3. To make unstable or infirm; to unsettle; to weaken. [1913 Webster]
Ring out the grief that saps the mind. --Tennyson. [1913 Webster]