To cover or form a crust over something.
From 'be-' (to cover or cause) plus 'crust' (from Latin 'crusta', meaning a hard outer shell or layer). The verb form means to coat or harden into a crust.
Crusts are fascinating linguistically—the word comes from Latin 'crusta' which also gives us 'crustacean' (shell-covered sea creatures), so 'becrust' literally means 'to shell or encase,' which is exactly what happens when bread bakes or mud dries.
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