n. 25B6; noun
sap from the roots of trees : JUICE, secretion, fluid, liquid.
they're full of youthful sap : VIGOUR, energy, drive, dynamism, life, spirit, liveliness, sparkle, verve, ebullience, enthusiasm, gusto, vitality, vivacity, fire, zest, zeal, exuberance; informal get-up-and-go, oomph, vim.
25B6; verb they sapped the will of the troops : ERODE, wear away/down, deplete, reduce, lessen, attenuate, undermine, exhaust, drain, bleed.