put to sleep

phrase

1

: to give (a sick or injured animal) drugs that will make it die without pain

2

informal : to use a drug to make (someone) unconscious before a medical operation : to give (someone) anesthesia before a medical operation

3

: to get (someone) ready to sleep for the night

Did you put the kids to sleep?

4

: to make (someone) fall asleep from boredom

Her lectures used to put me to sleep.