doorknob UK /ˈdɔː.nɒb/US /ˈdɔɹ.nɑb/noun 2verb 1forms 3 noun2 •A circular device attached to a door, the rotation of which permits the unlatching of the door.A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. — 2012 •(informal, offensive) A stupid person. verb1 •(especially psychiatry) To suddenly bring up a time-consuming topic when very little time remains to discuss it, often as a tactic to avoid conversation. formsdoorknobbed · doorknobbing · doorknobs