euthanize

US /ˈjuː.θə.naɪz/
UK /ˈjuː.θə.naɪz/
1.

làm chết êm dịu

to kill an animal because it is very old or sick or because there is no one to take care of it:

:
Overcrowded shelters would not be able to euthanize unwanted animals.