Word familyadjectiveApriliannounApril foolAprilApril Fools' Day
ˌApril ˈFools’ Day (also All Fools’ Day) noun
TRICK/DECEIVEApril 1st, a day when people play tricks on each other 愚人节〔4月1日〕
Examples from the Corpus
April Fools' Day• At first I thought it must be April Fools' Day.• He was indicted April Fools' Day.• He went to police college on April Fools' day, 1970, where he was the best student among his intake.• It's a charity thing - something to do with April Fools' Day.