“had second thoughts”是不是「有第二個想法」的意思？

今天上英語學程時，
Sideway Stories from Wayside School
Unit 27 Joy中有一句話，
But then Joy had second thoughts. She put back the cake…

“had second thoughts”是不是「有第二個想法」的意思？

根據Macmillan English Dictionary的解釋：
have second thoughts (about something) means
”begin to doubt a decision you have already made”
因此”had second thoughts”有「對先前所做的決定開始有所存疑」的意思。
類似的用法有
“on second thought”
used when you want to change something you have just said, often to say the opposite.