When you pretend you have a stomach ache so you do not have to go to school, this is an example of malinger.
Origin of malinger; from French malingre, sickly, infirm ; from mal, bad (see mal-) + uncertain or unknown; perhaps Old French heingre, lean, haggard
intransitive verbma·lin·gered, ma·lin·ger·ing, ma·lin·gers
Origin of malingerFrom French malingre, sickly.
(third-person singular simple present malingers, present participle malingering, simple past and past participle malingered)
From French malingrer, from adjective malingre.