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From The Collaborative International Dictionary of English v.0.48:
Sup \Sup\ (s[u^]p), v. t. [imp. & p. p. Supped; p. pr. & vb. n. Supping.] [OE. soupen to drink, AS. s[=u]pan; akin to D. zuipen, G. saufen, OHG. s[=u]fan, Icel. s[=u]pa, Sw. supa, Dan. s["o]be. Cf. Sip, Sop, Soup, Supper.] To take into the mouth with the lips, as a liquid; to take or drink by a little at a time; to sip. [1913 Webster] There I'll sup Balm and nectar in my cup. --Crashaw. [1913 Webster]