E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Gif Gaff.
Give and take, good turn for good turn.
1
“I have pledged my word for your safety, and you must give me yours to be private in the matter—giff gaff, you know.”—Sir W. Scott: Redgauntlet, chap. xii.
