to strike against something physically: to dash the foot against an obstacle and stumble, or for a force to beat violently upon a thing.
The oldest picture behind this word is a very ordinary one: a foot catching on a stone in the road. Greek writers used it for a man stubbing his toe in the dark, a horse's hoof striking a rock, or one hard object knocking against another. In the New Testament this plain physical sense stays in view. When the tempter quotes an old promise that angels will guard the traveler "so that you do not strike your foot against a stone," the word means exactly that: a foot hitting rock.
One use pushes the image further. In the story of the two builders, the winds "beat against" the house that was built on sand. Here nothing is stumbling; a force is crashing into a structure. It is the same striking picture, now applied to a storm, and it carries the weight of a coming collapse.
Even at its most literal the word can hint at more. In one saying about walking safely by day but tripping by night, the setting is a real road, yet the words are chosen so that the physical stumble also pictures a person walking without spiritual light.