have half a mind to do something

have half a mind to (do something)

To have an inclination or intention that is moderate, irresolute, or indefinite (but often one that was motivated by a specific unpleasant experience). My flight home was so terrible, I have half a mind to write a letter to the airline company and complain. We set out on the road with only half a mind as to where we would go!
See also: half, have, mind

have half a mind to do something

If you say that you have half a mind to do something, you are thinking about doing it or threatening to do it, although you probably will not do it. I was wet and weary and had half a mind to curl up on the hillside and wait for the rescue helicopter. I have half a mind to file a lawsuit against her. Note: You can also say that someone is of half a mind to do something. I was of half a mind to leave, but it was late so I stayed.
See also: half, have, mind, something