drop off

verb

To fall asleep.
“After two glasses of whiskey, Tom soon dropped off in front of the television.”
“And when the Boy dropped off to sleep, the Rabbit would snuggle down close under his little warm chin and dream, with the Boy's hands clasped close round him all night long.”
To deliver; to deposit or leave; to allow passengers to alight.
“Can you drop the kids off at school?”
“I'll drop off your books when I see you tonight.”
To fall off:
“The leaves were slowly dropping off the tree.”
To fall off:
“The leaves hung on until the end of November, then dropped off quickly.”
To end a connection with a telephone queue, either by hanging up or after being served or processed.
“As soon as a caller drops off, we'll have an open line and maybe you can reach us then.”
To lessen or reduce.
“Near-synonyms: taper off, dwindle”
“Sales have dropped off in recent months.”
To die.
To abandon or give up on (something); to be abandoned or given up on.
“My lawyer said some of those charges will be dropped off.”
“If you ignore them, the fees won't just drop off.”