THE IDIOM COLLECTION LEARN & PRACTISE
Have second thoughts
Understand the meaning. See it in context. Make it yours.
01 / UNDERSTAND
Meaning in plain English
To start doubting or reconsidering a decision or opinion.
02 / SEE IT IN CONTEXT
The expression in a sentence
- I am starting to have second thoughts about joining two courses at once.
03 / CHECK YOUR UNDERSTANDING
Quick idiom quiz
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Can you recall the expression?
Complete the example using the expression from this lesson.
I am starting to ________ about joining two courses at once.
Show the answer
Have second thoughts — To start doubting or reconsidering a decision or opinion.
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Make it yours
Write one sentence using “Have second thoughts” about your own life.
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Does your sentence match this meaning?
To start doubting or reconsidering a decision or opinion.
Compare: I am starting to have second thoughts about joining two courses at once.
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More ways to understand and use it
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When to use it
Use this expression when you are no longer sure about an earlier choice. It is useful in everyday conversations about plans, purchases or commitments.
More examples in context
- She had second thoughts after reading the full travel schedule.
- We are having second thoughts about holding the event outdoors.
Usage note
Use second thoughts in the plural and about before a topic or an -ing form. Reconsidering does not necessarily mean you have already reversed the decision. On second thought or on second thoughts can introduce a changed choice.
A short conversation
A: Are we still booking the small room?
B: I am having second thoughts. More people have registered.
A: Let’s compare the larger rooms before deciding.
One more practice question
What does having second thoughts about a booking mean?
A. Starting to doubt or reconsider the earlier booking decision.
B. Being completely certain that the original decision is best.
Check your answer
A. The expression signals renewed doubt or reconsideration, not complete certainty.
Related lessons
Meaning and usage checked against Cambridge Dictionary. Explanations, examples and conversation are original.