The opposite of "bends down" is "stands up straight." When someone bends down, their body is lowered towards the ground by bending at the hips and knees. On the other hand, when someone stands up straight, their back is straight, their shoulders are relaxed, and their chin is parallel to the ground. This position is typically associated with good posture and can help prevent back pain and muscular strain. Other antonyms for "bends down" include "rises up," "stretches tall," and "extends upward." These actions require the body to move in an upward direction, rather than towards the ground.