The phrase "knock bottom out of" usually implies destroying, ruining, or causing something to fail completely. However, some antonyms for this phrase could include enhance, strengthen, rebuild, or restore. For example, instead of knocking the bottom out of a business, one could work to enhance its marketing strategies and improve its performance. Similarly, instead of knocking the bottom out of a relationship, one could work to strengthen communication and trust between partners. By using antonyms for "knock bottom out of," we can shift our focus towards solutions and positive actions, rather than destruction and negativity.