"Agenbite of inwit:" Middle English phrase meaning "remorse of conscience," popularized by James Joyce in his 1922 novel Ulysses.
From Ulysses, chapter 10:
"She is drowning. Agenbite. Save her. Agenbite. All against us. She will drown me with her, eyes and hair. Lank coils of seaweed hair around me, my heart, my soul. Salt green death.
Agenbite of inwit.