The phrase "prank up" is usually used to describe someone's behavior becoming more mischievous or playful. There are multiple synonyms for this phrase, such as "amp up," "ratchet up," "heighten," "intensify," and "increase." These words all imply an escalating level of activity or behavior. For example, if someone is trying to prank up a party, they could increase the music volume, turn on more lights, or start more interactive games. Similarly, if someone is trying to prank up a conversation, they could add more jokes, sarcasm, or playfulness to spice up the exchange. The synonyms for prank up can help individuals to express themselves creatively, and to convey their intentions and feelings more effectively.