expression, ichidan verb
forget oneself; lose control of oneself
Used when someone becomes so absorbed in an emotion or activity that they lose their usual composure or act without restraint.
彼は怒りに我を忘れて叫んだ。
He forgot himself in anger and shouted.
美しい景色に我を忘れて見とれた。
I was so captivated by the beautiful scenery that I lost myself in it.