The phrase "bring to maturity" refers to the act of developing or cultivating something until it reaches its full potential. Some possible antonyms for this phrase include 'stifle growth,' 'hinder development,' 'suppress potential,' or 'retard progress.' These terms signify the opposite of bringing something to its full potential and can suggest that growth or development is being constrained or limited in some way. Other antonyms may include 'undernourish,' 'mismanage,' or 'neglect,' all of which imply a lack of care or attention paid to the growth or development of someone or something.