The phrase "keeping it down" implies the act of being quiet or reducing noise levels. Its antonyms can include "making noise," "becoming loud," "amplifying," "raising the volume," "shouting," or "screaming." These antonyms demonstrate the opposite of what "keeping it down" entails. For example, one might say "I need you to keep it down because I'm trying to work," while the antonym of this could be "I need you to speak up because I can't hear you." It is essential to be mindful of the context when choosing the appropriate antonym for "keeping it down.