Working

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Old English weorc (noun), wyrcan (verb), of Germanic origin; related to Dutch werk and German Werk, from an Indo-European root shared by Greek ergon .

wiktionary

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From Middle English werking, werkynge, warkynge, worchinge, from Old English wyrċung(“working, work”), verbal noun of wyrċan(“to work”), equivalent to work +‎ -ing. Cognate with Scots wirking, warking, Dutch werking, German Wirkung.

From Middle English workyng, wirkynge, worchinge, werchinge, workinde, wirkand, worchende, wurchende, from Old English wyrċende, from Proto-Germanic *wurkijandz, present participle of Proto-Germanic *wurkijaną(“to work”), equivalent to work +‎ -ing. Compare Scots wirkand, werkand, warkand(“working”), Dutch werkend(“working, acting”), German wirkend(“acting, working”).

etymonline

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working (adj.)

late 14c., "active, busy," present-participle adjective from work (v.). From 1630s as "engaged in physical toil or manual labor as a means of livelihood." Working class is from 1789 as a noun, 1839 as an adjective. Working-day is from late 15c.; working man is by 1816.

working (n.)

"action, operation," verbal noun from work (v.).