decrab noun 1verb 1forms 3 noun1 •The process of aligning an aircraft with the runway, usually by means of rudder or rudderon input, immediately before, simultaneously with, or immediately after touchdown during a landing from a crabbed approach. verb1 •To align (an aircraft) with the runway, usually by means of rudder or rudderon input, immediately before, simultaneously with, or immediately after touchdown during a landing from a crabbed approach. formsdecrabbed · decrabbing · decrabs