Weaken/ˈwiːkən/ Definition 1 of 3Pro Tip 1/3Physical Impact Weaken can describe reduced physical strength, durability, or stability of objects or systems. The storm weakened the bridge's structure. Pro Tip 2/3Gradual Process Weaken often implies a gradual process, not an immediate change. Continued exposure to sunlight weakened the color of the fabric. Pro Tip 3/3Impact of Actions Actions we choose can unintentionally weaken things, being aware is crucial. Skipping practice sessions will weaken your playing skills.