To Struggle
Intransitive verb and Godan verb
くるしむ
トーフグの考え方は、理かいに苦しみます。
It’s really hard to understand Tofugu's way of thinking.
はんざいに手をそめるようそそのかしてくるコウイチからの強れつなプレッシャーに苦しんでいます。
I'm struggling under intense pressure from Koichi, who aided and abetted me in a crime.
オレは家にいるおまえの新妻のことを考えて言ってるだけだよ。分かるか？彼女がお前の死で一生苦しむことになっても、本当にいいのか？だから、自殺なんてするなって。
I’m just thinking about your new wife at home. Okay? Do you really want to make her suffer from your death for the rest of her life? So, don’t commit suicide.
You learned the word 苦しい (hopefully) in level 9. That word means suffering. So, if you make that into a verb version, you have to suffer.
The reading comes from 苦しい, so as long as you're on top of that word, this word should be readable for you as well.