envenom

To inject or put venom onto or into (someone or something).

As when Alcides from Oealia Crown’d With conqueſt, felt th’ envenom’d robe, and tore Through pain up by the roots Theſſalian Pines […]

Nay, was it I who wooed thee to this breast, / Which like a serpent thou envenomest / As in repayment of the warmth it lent?

To acerbate, make bitter.

Oh what a world is this, when what is comely Enuenoms him that beares it?