To channel or contain something in or as if in a trough, or to form into a trough shape.
From 'be-' plus 'trough,' from Old English 'trog,' ultimately from Proto-Germanic. The verb suggests forming something into a channeling or containing shape.
A 'trough' is one of those wonderfully specific Old English words—it originally meant any hollowed-out container, and now we use it for everything from pig feed to wave measurement.
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