to be shy; to be bashful; to feel awkward; to feel embarrassed
褒められて照れてしまった。
I got embarrassed from being praised.
彼は照れた顔で花を差し出した。
He held out the flowers with an embarrassed face.
人前で歌うのは照れるからやめておく。
I'll pass on singing in front of people because it's embarrassing.