1fess upAmerican EnglishAmE informalADMITto admit that you have done something wrong, although it is not very serious 承认,交代SYN own up
Come on, fess up! Who ate that last cookie?
好了,从实招来!最后那块甜饼谁吃了?
Examples from the Corpus
fess up• Come on, fess up - you must have been the one who told her because no-one else knew!• If none of you guys fesses up, you're all grounded for a week.