Sag/sæɡ/ Definition 1 of 3Pro Tip 1/3Physical Objects Typically describes how physical objects bend or curve due to weight or pressure. The overloaded bridge began to sag noticeably. Pro Tip 2/3Visual Imagery Evokes a clear image of something bending down in the middle. The garden's archway sagged after the storm. Pro Tip 3/3Not Instant The action of sagging usually happens gradually, not all at once. Over the years, the porch step began to sag.