Any tool which is not a hammer (such as a large spanner), which is used as a hammer. Often deployed in inaccessible places, e.g. when working underneath a car, in the absence of a hammer. Almost the opposite of the Manchester screwdriver
The nut was so tight that it wouldn't undo, so I hit the wrench with a wimbling iron and that loosened it.
by phild January 14, 2013