Depending on what axis you want the parallelism to be seen from:

To take care of someone

This was done nicely in a sort of old Western parody with Andy Griffith(!) as the evil cattle baron explaining to one of his minions that when he said "take care of" the sodbuster that was complaining too loudly about the cattle trampling his garden he meant "kill him". Then, when his beautiful daughter, who was secretly in love with the sodbuster's son, came in, he told another minion to "take care of her", meaning get her to her part of the house and fed, or whatever. He had to stop the minion when he pulled his gun and started to threaten the daughter.

Put to sleep/put down

If it is an old and incurable pet it means one thing, if it's your darling baby daughter, it's something quite else.