LET (SB) DOWN : ~를 실망시키다. : an act of disappointing someone; disappointment I won't let you down. >실망시키지 않을게. I don't want to let myself down. >내 자신을 실망시키고 싶지 않아. I felt like I had let down my favorite teacher. >내가 가장 좋아하는 선생님을 실망시켜드린 기분이었다. The news let me down. >그 뉴스를 듣고 실망했다. 제가 당신을 정말 실망시킨 것 같아요. *드래그 I guess I really let you down.