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A Dictionary of Law · Henry Campbell Black · 1891
A Dictionary of Law
(Lat. I do that you may do.} <A species of contract in the ¢tivil law (being one of the innominate contracts) which occurs when I agree with a min to do his work for him if he will do mine for me; or if two persons agree to marry together, or to do any other positive acts on both sides; or it may be to forbear on one side in consideration of something done on the other, 2 31. Comm. 444.