to disappoint someone
誰かを失望させる (dareka o shitsubō saseru)
"I felt really let down when my friend didn’t show up."
"友達が来なかったとき、私は本当に失望しました。" (Tomodachi ga konakatta toki, watashi wa hontōni shitsubō shimashita.)
to deal successfully with a difficult situation or challenge
to become thinner; to lose weight
to start an event or activity
to make progress in the direction of something
to show romantic or sexual interest in someone
to maintain contact or communication with someone over time