The antonyms for the word "shrank back" include advancing, approaching, moving forward, stepping forward, and proceeding forward. These antonyms describe actions that are opposite to shrinking back or retreating. When we advance or approach, we move towards something or someone, showing courage and confidence. Moving forward or stepping forward implies taking a step in a positive direction, without fear or hesitation. Proceeding forward suggests continued progress or advancement, without any backward movement. By using these antonyms, we can create a sense of momentum, progress, and determination in our writing, instead of focusing on negative actions, such as retreat or withdrawal.