bulge

This word evokes a sense of internal pressure pushing against a boundary. It suggests a tension where the surface is nearly at its limit, creating a visible, rounded distortion. It is often used to describe physical objects like pockets, walls, or muscles, but carries a strong visual quality of being overfilled. In a social or statistical context, it refers to a disproportionate increase in a specific segment of a population. This usage shifts the image from a physical bump to a numerical spike, such as a baby boom creating a demographic bulge that moves through different age groups over time.