The phrase "blowing out of the water" means to completely defeat or outperform someone or something. Antonyms for this phrase could include "falling short," "underperforming," or "coming up short." These terms imply that the subject is not meeting expectations or failing to meet a certain standard. Other antonyms could be "losing ground," "lagging behind," or "falling behind," indicating that the subject is not keeping pace with others. In short, any term that suggests the subject is not succeeding or excelling would be an appropriate antonym for "blowing out of the water.