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engross (v.)[engross 词源字典]: 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.[engross etymology, engross origin, 英语词源]
gross (v.): "to earn a total of," 1884, from gross (adj.) in the "whole, total" sense. Slang meaning "make (someone) disgusted" (usually with out) is from 1971. Related: Grossed; grossing.