Third person singular form; covers with or forms a crust upon.
Present tense third-person form of 'becrust,' formed by adding the '-s' suffix. Maintains the 'be-' plus 'crust' structure.
In modern English we'd just say 'crusts over,' but 'becrusts' is punchier and more complete-sounding—it suggests the whole thing is being covered, not just that a crust is forming, which is why older, more poetic writers preferred these 'be-' verbs for descriptive power.
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