尽くす

Etymology
From. Found in the ', completed some time after 759, spelled phonetically in ' as 都久須.

Verb

 * 1) To exhaust; deplete; use up.
 * 2) serve, assist
 * 1) serve, assist

Suffix

 * 1) to do to exhaustion, to do something completely

Usage notes
Attach after the of a verb.