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From The Collaborative International Dictionary of English v.0.48:
Breakfast \Break"fast\, v. i. [imp. & p. p. breakfasted; p. pr. & vb. n. Breakfasting.] To break one's fast in the morning; too eat the first meal in the day. [1913 Webster] First, sir, I read, and then I breakfast. --Prior. [1913 Webster]