Multiple choice Directions: Choose the opposite of the given word: Bolster Augment Undermine Boost Strengthen Sustain Reveal answer Fill a bubble to check yourself B Correct answer Explanation Bolster means to support, strengthen, or reinforce something. Undermine is the direct opposite because it means to weaken, damage, or destabilize from beneath. Augment, Boost, Strengthen, and Sustain are all synonyms of bolster.