Squint/skwɪnt/ Definition 1 of 4Pro Tip 1/3Narrowed Vision Squinting involves partly closing the eyes, which limits your field of vision. You may need to squint when facing bright lights. Pro Tip 2/3Focus for Clarity Squinting can help see more clearly by shaping the eye to focus light better. Squint for a clearer view of that distant sign. Pro Tip 3/3Facial Response Squinting is often an involuntary reaction to protect your eyes. I automatically squinted when I walked outdoors.