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What does doing something for blood mean

Posted by GPP on August 27, 2003

In Reply to: What does doing something for blood mean posted by Brian on August 27, 2003

: Is anyone familiar with the saying "doing something for blood? "I heard it used like this, "I don't teach anymore for fun, I teach for blood" And they seem to mean it in a possitive way.

: Thanks in advance.

In your example, it would mean some like 'with a vengeance', to use a different idiomatic phrase. It means the teacher has become annoyed with the students not learning, so he/she is going to get serious with them.