LETDOWN
NOUNS
1910 — GUTSER → GUTZER a disappointment; a let-down; a misfortune → Aust. sl.
.M20 — KICK IN THE ASS an unwarranted punishment or letdown → US colloq.
1950 — BALLOON ROOM WITHOUT A PARACHUTE a disappointment, a let-down; esp. a place where one has been promised a smoke of marijuana but which, in fact, offers no supply → African-American sl.
2006 — COMEDOWN a letdown; a disappointment → US sl. (Bk.)
VERBS
1920 — RANK to betray, to let down → US sl.
1950 — LET THE AIR OUT OF to let down, to deflate emotionally → US sl.
1990 — FADE to let down, to renege → US sl.
Lexicophilia 