معنى مفسد

Once in a while, though, try to ruin my day ask me something I can say "Yes" to.

Wouldn't want to operate on anyone really sick. They might die and spoil our stats.

He lied to me first. Your mother did teach you two wrongs don't make a right.

Well, now, let's not ruin a lovely night out by getting personal.

Well, cover your ears if you don't want me to spoil the ending.

You lie to me, you mess up my son's surgery, and now you expect me to trust you?