To abut means to touch or border directly on something, sharing a boundary or edge. When two properties abut each other, their edges meet along a shared fence or property line. When a building abuts a sidewalk, one of its walls sits right against where the sidewalk begins.

The word often appears in real estate and construction. A homeowner might say their backyard abuts a forest preserve, meaning the forest starts exactly where their yard ends. City buildings often abut each other, sharing walls with no space between them, which is why you might hear neighbors through the walls.

You'll also see abut used in engineering and carpentry. When two pieces of wood abut, they're placed end to end or edge to edge, fitting together without overlapping. Bridge sections might abut each other, meeting precisely where one section ends and another begins.

The word suggests a clean, direct connection rather than overlap or separation. Think of it as architectural touching: specific, intentional, and exact. When something abuts something else, there's no gap, no overlap, just two things meeting right where they should.