Completely focused on or absorbed in something; deeply interested to the point of not noticing anything else.
From Old French 'engrosser' meaning to make thick or large. Originally meant to write in large letters, then evolved to mean occupying completely (filling one's attention).
When medieval monks wrote 'engrossed' manuscripts in large, thick letters, they were filling the whole page—now we're 'engrossed' when something fills our entire mind completely.
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