There are plenty of synonyms to choose from when it comes to the word "flinching." Some of the most commonly used ones include wincing, cringing, recoiling, shrinking, and cowering. All of these words basically refer to the act of drawing back or shrinking from something, especially when afraid or in pain. Other potential synonyms for "flinching" might also include trembling, quivering, shaking, shuddering, or even twitching. Depending on the exact context and connotations, different synonyms might be more appropriate or more effective in conveying the intended meaning. Regardless of which synonym you choose, the underlying implication is typically one of fear or discomfort.