'Pretend' in the Bible

Jonadab said to him, “Lie down on your bed and pretend you’re sick. When your father comes to see you, say to him, ‘Please let my sister Tamar come and give me something to eat. Let her prepare food in my presence so I can watch and eat from her hand.’”

So Joab sent someone to Tekoa to bring a clever woman from there. He told her, “Pretend to be in mourning: dress in mourning clothes and don’t put on any oil. Act like a woman who has been mourning for the dead for a long time.