milk the bull
milk the bull
old-fashioned To engage in an activity or enterprise that has no chance of succeeding; to do something pointless or futile. (A bull is a male cow and cannot be milked.) Everyone told us we were milking the bull when we set up our online store during the infancy of the Internet, but now we're one of the most successful companies in the world. I don't know why you bother arguing with him. You're just milking the bull if you think you're going to change his mind.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
milk the bull (or ram)
engage in an enterprise doomed to failure.Farlex Partner Idioms Dictionary © Farlex 2017