sapped

/S AE1 P T/
verb
  1. 1

    To drain, suck or absorb from (tree, etc.).

  2. 2

    To exhaust the vitality of.

verb
  1. 1

    To strike with a sap (with a blackjack).

verb
  1. 1

    To subvert by digging or wearing away; to mine; to undermine; to destroy the foundation of.

  2. 2

    To pierce with saps.

  3. 3

    To make unstable or infirm; to unsettle; to weaken.

  4. 4

    To gradually weaken.

    โ€œhe saps my energyโ€

  5. 5

    To proceed by mining, or by secretly undermining; to execute saps.

Source: https://en.wiktionary.org/wiki/sap, https://en.wiktionary.org/wiki/sapped