What is "embitters"

Usage examples of "embitters".

When I think of the javelina meat I et and the bare-footed bandits I had to associate with whilst living in Old Mexico to avoid having to kill that wuthless critter, his present attitude embitters me.

Leete, however, desired me to reflect, and I am ready to say that it is perhaps a sufficient reply to my objection, that the worker's livelihood is in no way dependent on his ranking, and anxiety for that never embitters his disappointments.