Plain old telephone system


Public Switched Telephone Network

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  • Plain-people

    plural noun 1. members of the Amish, the Mennonites, or the Dunkers: so named because they stress simple living.

  • Plain-rail

    noun 1. (in a double-hung window) a meeting rail equal in thickness to its sash.

  • Plains

    [pleyn] /pleɪn/ adjective, plainer, plainest. 1. clear or distinct to the eye or ear: a plain trail to the river; to stand in plain view. 2. clear to the mind; evident, manifest, or obvious: to make one’s meaning plain. 3. conveying the meaning clearly and simply; easily understood: plain talk. 4. downright; sheer; utter; self-evident: […]

  • Plain-sail

    noun, Nautical. 1. any of the ordinary working sails of a vessel. 2. all these sails, taken collectively.

  • Plain-sailing

    noun 1. Navigation. sailing on waters that are free of hazards or obstructions. Compare . 2. an easy and unobstructed way, course, or plan: As an heir to a large fortune, he looked forward to financial plain sailing. noun 1. (informal) smooth or easy progress 2. (nautical) sailing in a body of water that is […]


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