COW IDIOMS (Today's video has no words, but since it features cows, we thought you might be interested in these expressions.)

To have a cow is slang for getting angry.
Mum will have a cow when she finds out.

Until the cows come home means for ever, or for a very long time.
If you try to catch a bus after midnight, you'll be waiting until the cows come home.

A sacred cow is a disapproving term for something that is always respected and never criticised.
Cancer charities are such sacred cows that no-one dares complain about them or ban them ringing people up to ask for donations.

Click here for more idioms and common expressions.