五段動詞(む)自動詞
to strain (oneself); to bear down; to exert oneself; to try (too) hard; to draw one's body taut
我慢して**力んだ**結果、腰を痛めてしまった。
- As a result of holding back and straining myself, I ended up hurting my lower back.
彼は体調が優れないのに、無理をして仕事に**力む**ことがあります。
- Even though he is not feeling well, he sometimes pushes himself too hard at work.