Antonyms for the phrase "give boost" include "hold back," "discourage," "impede," "hinder," and "slow down." These words imply a lack of support, progress, or advancement. Holding back may indicate a reluctance or indifference to ensuring success, while discouragement suggests actively dissuading someone from pursuing their goals. Impeding and hindering indicate obstacles in the way of progress, while slowing down implies a lack of urgency or motivation. These antonyms serve as a reminder of the importance of actively supporting and encouraging others to achieve their goals and reach their full potential.