put to sleep

verb5

1. •
   To cause (someone) to sleep.

   • His boring stories sometimes put me to sleep.
2. •
   (euphemistic) To kill an animal painlessly, often with an injection.

   • It was sad to put our beloved spaniel to sleep, but it was better than letting him suffer.
3. •
   To help (someone) to bed.

   • After they'd put the kids to sleep, they relaxed by the fire and chatted.
4. •
   (figurative) To render dormant.

   • Our jealousy is only put to sleep by the unlimited confidence we all repose in the person to whom we all look as our president. — 1787
5. •
   (informal) To give a general anesthetic prior to surgery.

   • Mommy's surgery is not a big operation but it does require that they put her to sleep for a while.