a second thought

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a second thought

A pause for a second or further consideration; a hesitation or concern about (doing) something. It isn't worth a second thought at this stage. When we were kids, we never gave a second thought about whether this food or that was good for us—we tried to eat what tasted good, and tried to avoid what tasted bad.
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a second thought

a moment's further consideration; any worry or concern.
See also: second, thought