Origin of April fool
Examples from the Web for april fool
You know, Mrs. Vanderhook expects me to look after the decorations of her April-Fool tea party.The Gay Gnani of Gingalee|Florence Huntley
Bertie walks slowly toward the door, but stops halfway there, and asks, "Is it April-fool's Day?"
1680s; April-gowk (from Old Norse gaukr "a cuckoo") is a northern variant. April Fool's Day customs of sending people on false errands seem to have come to England from France late 17c.; originally All Fool's Day (1712). In Cumberland, Westmorland and northern parts of Lancashire and Yorkshire, however, May 1 was the day for hoaxing, and the fool was a May gosling. That custom was first attested 1791.