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1820, from French malingrer "to suffer," perhaps also "pretend to be ill," from malingre "ailing, sickly" (13c.), of uncertain origin, possibly a blend of mingre "sickly, miserable" and malade "ill." Mingre is itself a blend of maigre "meager" + haingre "sick, haggard," possibly from Germanic (cf. Middle High German hager "thin"). The sense evolution may be through notion of beggars with sham sores. Related: Malingered; malingering; malingerer (1785).
malinger ma·lin·ger (mə-lĭng'gər)
v. ma·lin·gered, ma·lin·ger·ing, ma·lin·gers
To feign illness or other incapacity in order to avoid duty or work.