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From The Collaborative International Dictionary of English v.0.48:
Underfong \Un`der*fong"\, v. t. [AS. underfongen, p. p. of underf[=o]n to undertake; under under + f[=o]n to take. See Fang to seize.] 1. To undertake; to take in hand; to receive. [Obs.] --Piers Plowman. --Rom. of R. [1913 Webster] 2. To insnare; to circumvent. [Obs.] --Spenser. [1913 Webster] 3. To sustain; to support; to guard. [Obs.] --Nash. [1913 Webster]