Buttressing

: Iconic in Gothic cathedrals like Notre Dame de Paris, these arches bridge the gap between an outer pier and the wall, allowing for massive stained-glass windows. 2. Figurative Reinforcement

Beyond stone and mortar, "buttressing" is used as a verb to describe strengthening intangible things:

In construction, a is a masonry support built against an exterior wall. It is designed to counteract the lateral (sideways) pressure exerted by heavy roofs or arches, pushing the force downward into the ground.