clip-chairn. a chair used on some railways to secure the rail to a metallic sleeper.
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a1884 E. H. KnightPract. Dict. Mech. Suppl. 200/2 The clip chair is of horse-shoe shape, one side forming a hook about 2 ¼″ wide, and the other side is like one jaw of an ordinary railway chair for taking a wooden railway key.