A ‘slip’ of the memory, the tongue, the pen, or †the understanding; a slight error, a mistake.

An error in conduct; esp. an instance of moral fault or transgression.

A lapse, slip, or error. Chiefly in the Latin phrases lapsus linguae n. a slip of the tongue, and lapsus calami n. a slip of the pen.

An unfortunate lapse. Obsolete.