What's the difference between breastsummer and brestsummer?

Breastsummer

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Definition:

• (n.) A summer or girder extending across a building flush with, and supporting, the upper part of a front or external wall; a long lintel; a girder; -- used principally above shop windows.

Example Sentences:

Brestsummer

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Definition:

• (n.) See Breastsummer.

Example Sentences: