sliced bread
US /ˌslaɪst ˈbred/
UK /ˌslaɪst ˈbred/
1.
bread that has been cut into slices, typically by a machine, before being packaged
:
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She bought a loaf of sliced bread for sandwiches.
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Toast is often made from sliced bread.
2.
used to refer to something that is considered to be an excellent invention or idea
:
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This new app is the best thing since sliced bread.
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He thinks his idea is the best thing since sliced bread.