Absorb

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late Middle English: from Latin absorbere, from ab- ‘from’ + sorbere ‘suck in’.

wiktionary

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From Middle French absorber, from Old French assorbir, from Latin absorbeō(“swallow up”), from ab-(“from”) +‎ sorbeō(“suck in, swallow”). Compare French absorber.

etymonline

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absorb (v.)

"to drink in, suck up, take in by absorption," early 15c., from Old French absorbir, assorbir (13c., Modern French absorber), from Latin absorbere "to swallow up, devour," from ab "off, away from" (see ab-) + sorbere "suck in," from PIE root *srebh- "to suck, absorb" (source also of Armenian arbi "I drank," Greek rhopheo "to sup greedily up, gulp down," Lithuanian srebiu, srėbti "to drink greedily"). Figurative meaning "to completely grip (one's) attention" is from 1763.