a: territory considered by a teenage gang to be under its control
b:territory 2 <have to play two of the last three games on hostile turf — Joe Klein><in chapter two, the author is on unfamiliar turf>; also: a sphere of activity or influence <people who could hurt him on his own foreign-policy turf — Wall Street Journal>
In horticulture, the surface layer of soil with its matted, dense vegetation, usually grasses grown for ornamental or recreational use. Such turf grasses include Kentucky bluegrass, creeping bent grass, fine or red fescue, and perennial ryegrass among the popular cool-season types, and Bermuda grass, zoysia grass, and St. Augustine grass among the warm-season types. Turf grasses are often grown on turf, or sod, farms. Plugs, blocks, squares, or strips are cut and transplanted to areas where they quickly establish and grow. Lawns are fine-textured turfs that are mowed regularly and closely to develop into dense, uniformly green coverings that beautify open spaces and provide sports playing surfaces (e.g., tennis lawns, golf and bowling greens, and racing turfs).