Etymology
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engross (v.)

c. 1400, "to buy up the whole stock of" (in Anglo-French from c. 1300), from Old French en gros "in bulk, in a large quantity, at wholesale," as opposed to en detail. See gross.

Figurative sense of "absorb the whole attention" is first attested 1709. A parallel engross, meaning "to write (something) in large letters," is from Anglo-French engrosser, from Old French en gros "in large (letters)." Related: Engrossed; engrossing.

updated on January 07, 2013

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Definitions of engross from WordNet

engross (v.)
devote (oneself) fully to;
Synonyms: steep / immerse / engulf / plunge / absorb / soak up
engross (v.)
consume all of one's attention or time;
Synonyms: absorb / engage / occupy
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.