The constant work pressure made him feel trapped under the oppression of stress.

oppression 是由动词 oppress（压迫）加上名词后缀 -ion 构成的名词形式。oppress 本身由前缀 ob-（表示"对抗"）和词根 press（压）组成，字面意思是"对抗性地压制"。oppression 指"压迫、压制"的状态或行为，在这里比喻压力带来的精神压迫感。