Idioms

Two idiomatic expressions related to work/business.
To be up to your eyes in work
A cash cow

Are you up to your eyes in work?

What examples of cash cows can you think of?

1. You look really tired. Why don't you go home?
I can't. I'm up to my eyes in work and I have to finish all of it.
I can't. I'm up in work and I have to finish all of it.
I can't. I'm down with work and I have to finish all of it.
2. How did he make his fortune?
He invested cash in a cow.
The product he developed sells so well that is a real cash cow. Money keeps coming in!
The product he developed sell so well that is a real cow cash. Money keeps coming in!
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