go a woolgathering

• 心不在焉；胡思乱想(常与wits连用)

go a woolgathering的用法和样例：

例句

1. He answered me in a rather preoccupied manner.
   他心不在焉地回答我。
2. She is absent-mindedly washing a plate.
   她心不在焉地刷洗盘子。
3. I used to have a lot of ideas when I was a kid.
   我小时候常常喜欢胡思乱想。
4. The manager floundered among a jumble of thoughts.
   这位经理在胡思乱想。