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From The Collaborative International Dictionary of English v.0.48:
Overflow \O`ver*flow"\, v. t. [imp. & p. p. Overflowed; p. pr. & vb. n. Overflowing.] [AS. oferfl?wan. See Over, and Flow.] 1. To flow over; to cover woth, or as with, water or other fluid; to spread over; to inundate; to overwhelm. [1913 Webster] The northern nations overflowed all Christendom. --Spenser. [1913 Webster] 2. To flow over the brim of; to fill more than full. [1913 Webster]