to cost or require as an expense; an archaic verb form.
From 'be-' plus 'cost'. While rarely used, this verb would follow the pattern of other 'be-' verbs, though 'cost' already functions adequately as a verb.
When a word already does its job perfectly (like 'cost' as a verb), adding 'be-' becomes redundant, which is probably why becost never caught on.
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