To trace over something again or to follow the outline of something with a trace or marking.
From the prefix 'be-' (meaning to cover or affect thoroughly) combined with 'trace,' meaning to follow a line or outline. This construction became productive in Middle English.
The prefix 'be-' is a hidden gem in English—it originally meant 'around' or 'about,' but over centuries it evolved into this abstract intensifier that makes verbs feel more complete and thorough.
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