What word or phrase does your mother always say?
1610s, from Latin contiguus "near, touching, bordering upon," from root of contingere "to touch upon" (see contact). Earlier form, now obsolete, was contiguate (mid-15c.).
contiguous con·tig·u·ous (kən-tĭg'yōō-əs)adj.
Sharing an edge or boundary; touching.