1 [transitive] fake something to make something false appear to be real, especially in order to cheat somebody
She faked her mother's signature on the document.
He arranged the accident in order to fake his own death.
2[transitive, intransitive] fake (something) to pretend to have a particular feeling, illness, etc.
She's not really sick—she's just faking it.
He faked a yawn.
Your child is pretending to eat something.
Is it idiomatic to say "are you faking eating something?" because your child may not understand the formal verb "pretend" ?