Facio ut facias
Defined in 4 dictionaries — Ballentine's (1916), Black's (1910), Black's (1891), Burrill (1850)
Ballentine's Law Dictionary
James A. Ballentine · 1916
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A Dictionary of Law
Henry Campbell Black · 1891
(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.
A New Law Dictionary and Glossary
Alexander M. Burrill · 1850
Lat. (I do that you may do.)
In the civil law. Words used to express that kind of contract where a person agrees to do some act for another, if the other will do some other act for him. 2 BL Com. 444. See Facto ui dee,