The amount that a crate can hold; a crate and all its contents together.
From 'crate' plus the suffix '-ful,' which creates nouns meaning 'the amount that fills' (like 'handful' or 'spoonful'). This follows a standard English pattern for measuring quantities.
Just like a 'handful' is what your hand can hold, a 'crateful' is what a crate can hold—English uses '-ful' to measure how much containers can carry!
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