|1.||put down to sleep|
A word or phrase people think of to avoid the truth, that "putting someone/thing down to sleep" is simply killing.
"Put down to sleep" is almost always used in the meaning of giving a pet animal a shot which will kill them, in order to put it out of its misery of a fatal sickness.
See also: abortion, silence
I guess we have to ki-- *cough* I mean, put our dog down to sleep, cuz it has SARS.