bright as a button
US /braɪt əz ə ˈbʌt.ən/
UK /braɪt əz ə ˈbʌt.ən/
1.
very intelligent and quick-witted
:
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Even at 90 years old, my grandmother is still bright as a button.
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The new intern is bright as a button and learns quickly.
2.
lively and cheerful
:
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After a good night's sleep, she woke up bright as a button.
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Despite the long journey, the children were still bright as a button when they arrived.