/fu:l ||; ful/verb1 [T] fool sb (into doing sth) to trick sb 哄骗；欺骗: Don't be fooled into believing everything that the salesman says. 别让推销员把你骗得糊里胡涂的，他说什么你就信什么。
2 [I] to speak without being serious 开玩笑: You didn't really believe me when I said I was going to America, did you? I was only fooling. 你不是真的相信我说的要到美国去吧？我只是开玩笑罢了。
fool about/around to behave in a silly way 做傻事:
Stop fooling around with that knife or someone will get hurt! 别再乱耍那把刀子，否则会伤到人。