Turf lost is when a group or gang lose a territory in the neighborhood. Usually the causes of these are because of other gangs.

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1. area of expertise: an area in which somebody has authority or expertise (informal) industry lobbyists protecting their own turf
2. territory: a territory or geographic area (informal)

3. gang territory: an area or territory that a gang claims as exclusively its own (informal

--COLLINSDAX "at your service"