The word "trapped" in Russian is for me one of the most challenging to understand.
I found the following related expressions:
1. "он в эмоциональных крючек"
2. "долговы яме"
3. "долговых сетях"
4. "любовная ловушка"
But I cannot find anywhere the adjective "trapped" or the participle, in order to build a simple expression: "He feels trapped".
Also how I will say "They have trapped him by making him to sing a deal he couldn't understand"