되새겨요 · 되새겼어요 · 되새길 거예요 · 되새기세요
to reflect on, to go over again in one's mind; to chew the cud
Example
선생님의 조언을 마음속으로 여러 번 되새겼어요.
I went over my teacher's advice in my mind many times.
Word parts
되- 'again' + 새기다 'to chew the cud'; 되새김질 is what cows do.