Chambers: To mimic, to imitate
would this not be construed as feigning, pretending or acting out a bogus illness or injury.
eg; to claim money for a back injury that hasn't actually injured your back, you would have to imitate the actions associated with a back injury.
Ooh-ouch-oh my back's killing love, make me a cup of tea, I can't get out of this chair with my really painful back.