April 1, a day when practical jokes are traditionally played

Alternative spelling of April Fools' Day

The first day in April, when tricks and practical jokes are traditionally played

(idiomatic, chiefly in the negative) To be tolerant of stupidity or incompetence in other people.

(economics) Theory that the price of an object is determined by irrational beliefs and expectations of market participants, rather than intrinsic value; i.e. that one can make money by buying something for the sole reason of selling it to some one else for a higher price.

Alternative form of suffer fools gladly

plural of April Fools' Day

plural of All Fools' Day

Alternative form of you could have fooled me

An imaginary personage said to like everything that is good, and plenty of it.