1 [I] fiddle (about/around) (with sth) to play with sth carelessly, because you are nervous or not thinking （因紧张或心不在焉而）胡乱摆弄: He sat nervously, fiddling with a pencil. 他紧张地坐着，手里不停地摆弄着铅笔。

2 [T] (informal 非正式) to change the details or facts of sth (business accounts, etc) in order to get money dishonestly 篡改（账目等以骗财）: She fiddled her expenses form. 她篡改了开支报表。