1. to deliberately encourage or promote feelings of resentment, anger, and dissatisfaction in oneself or others
Years of unfair treatment fostered bitterness in his heart.
Anos de tratamento injusto cultivaram amargura em seu coração.
2. to create conditions that lead to the development of hostile or resentful emotions
The scandal fostered bitterness among the community members.
O escândalo cultivou amargura entre os membros da comunidade.