<p><strong>Verb (used without object):</strong></p><ul><li>To become unconscious from alcohol or narcotic drugs; pass out.</li><li>To fall soundly asleep or relax completely: "I've got to go home and zonk out."</li></ul><p><strong>Verb (used with object):</strong></p><ul><li>To stupefy, as by alcohol or narcotic drugs.</li><li>To sedate or anesthetize: "If the pain gets too bad the doctors will zonk you."</li><li>To strike or defeat soundly; knock out; clobber.</li></ul>