The ability to lock onto a screen object so that it can be dragged with the mouse without continuously holding down the mouse (or trackball) button.
"drag lock." YourDictionary, n.d. Web. 15 June 2018. <http://www.yourdictionary.com/drag-lock>.
drag lock. (n.d.). Retrieved June 15th, 2018, from http://www.yourdictionary.com/drag-lock