When juliet offers a fake apology to her father, she notes that she has been instructed by the friar “to fall prostrate here.” explain the double meaning of juliet’s statement here

"To fall prostrate" means to fall down at someone's feet. Usually this is done to someone in a position of higher power to show respect or grovel for something. Juliet is falling at her father's feet for "forgiveness" about how she acted earlier, but the double meaning is that the Friar also gave her the potion that is going to make her fall down as if she is dead.