"To give up on a whim" 是一个常用的表达，意思是随便放弃。例如："She decided to give up on her job on a whim and move to a new city." 这句话的意思是她随便放弃了工作，搬到了一个新城市。
另外，"to give up on the spur of the moment" 也可以用来表示随便放弃的意思。例如："He gave up on his dream on the spur of the moment when he reapzed how much hard work it would take." 这句话的意思是他意识到要付出多少努力之后，随便放弃了梦想。
另外，"to give up on the spur of the moment" 也可以用来表示随便放弃的意思。例如："He gave up on his dream on the spur of the moment when he reapzed how much hard work it would take." 这句话的意思是他意识到要付出多少努力之后，随便放弃了梦想。