'Pretend' in the Bible

Jonadab replied to him, "Lie down on your bed and pretend to be sick. When your father comes in to see you, say to him, 'Please let my sister Tamar come in so she can fix some food for me. Let her prepare the food in my sight so I can watch. Then I will eat from her hand.'"

So Joab sent to Tekoa and brought from there a wise woman. He told her, "Pretend to be in mourning and put on garments for mourning. Don't anoint yourself with oil. Instead, act like a woman who has been mourning for the dead for some time.