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Difference between Bright as a button and Bright as a new pin

bright as a button—(usually of children) intelligent; quickminded:

  • You can’t fool Mandy. She may be only six years old, but she’s bright as a button.

Note: The expression is antonymous in meaning to the phrase bright as a two-watt bulb(Austral., ironic) dull or stupid:

  • Johnnie’s about as bright as a two-watt bulb, and sometimes the light’s a little slow coming on.

bright as a new pinsaid of smth. spotlessly clean and shiny:

  • After Nora cleaned the house, it was as bright as a new pin.