like a ton of bricks

=> ton.

light-year, lighten, lighter, lighterage, lighterman, lighthearted, lighthouse, lighting, lightly, lightness, lightning, lightning conductor, lightning strike, lightning-bug, lightship, lightweight, ligneous, lignite, likability, like, like any thing, like-minded, likeable (also likable), likelihood, likely, liken, likeness, likes, likewise, liking, lilac, lilliputian, lilo, lilt, lilting, lily, lily of the valley, lily-livered, limb, limber,