Adevoted secretary catered to his every whim. 忠实的秘书总是顺着他，满足他所有的怪念头。

at sb’ s whim Prisoners were executed at the captain’ s whim. 战俘们被上尉随心所欲地处死了。

on a whim On a whim, she decided to go away for the weekend. 她一时心血来潮，决定周末外出。