beat
break
let down
short
cheat
fail
betray, sell
hornswoggle
cheat on
sell out
double cross
go back on
deceive
two-time
give way
cozen
to cheat, con, swindle, defraud
to deceive, delude, mislead
to betray
to on (gloss)
to way, down, fall/tumble down
to down, disappoint, desert, fail