1. 他那积愤需要有机会倾吐。不适合
He needs an outlet for all that pent-up anger.
2. 警方称该男子是位积愤的漫画家，他要求与西班牙语姐妹出版物的编辑见面。
Police said a disgruntled cartoonist was demanding to see an editor of the newspaper's Spanish-language sister publication.
3. 证人一股脑发出他的积愤。不适合
The witness delivered himself of all his pent-up hatred.
4. 积愤
4. 排解自己积愤的方法有很多种，不一定要喝酒呀。
There are many ways to dispel your pent-up fury besides drinking!