Webster’s Revised Unabridged Dictionary · 1913
Pipelaying
Pipe′lay′ing, n., or Pipe′ lay′ing. 1. The laying of conducting pipes underground, as for water, gas, etc.
2. (Polit. Cant) The act or method of making combinations for personal advantage secretly or slyly; — in this sense, usually written as one word. [U.S.]