(informal, figuratively) to come down to earth with a bump, to go back to earth with a bump, to have one's hopes dashed, to be very disappointed

(figuratively) to be a godsend; to come out of nowhere

(figuratively) to be exhausted, to be asleep on one's feet, to drop from exhaustion

(figuratively) to be exhausted, to be asleep on one's feet, to drop from exhaustion

to fall into ruin, to go to ruin, to fall into disrepair, to be tumbling down

to fall from grace, to fall out of favour

to fall out of favour, to fall into disrepute

to hit a snag, to find a fly in the ointment

(informal) to walk into a trap, to fall into the trap, to fall for something

to stand to reason