To infuse venom or bitterness into (actions, relations, etc.); to impart bitterness to (the feelings or words of a person); to embitter, make…

transitive. To make (a person) hostile or antagonistic towards a person; to imbue (a person) with hatred or dislike. Followed by against.

transitive. To make like a viper, to fill with a viper's nature.

transitive. To taint with sin or error; to corrupt; to exert an evil influence on; = poison, v. 2a. Now rare except as merged with sense 6.

To make sharp or sharper (in various transferred and figurative senses of the adjective). Now… To embitter, exacerbate (persons, their temper). Obs…