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box frame

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noun

Architecture. a monolithic reinforced-concrete structure having walls and floors in the form of slabs.
Building Trades. a window frame with pockets for sash weights.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of box frame

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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