pipe-opener

Noun

 * 1) A device for putting a hole in a pipe.
 * 2) A device or mechanism for clearing obstructions in a pipe.
 * 3)  A practice event; a warm-up.
 * 4)  A brisk walk or other aerobic exercise; a constitutional.
 * 5)  An example that serves as an introduction.
 * 1)  A brisk walk or other aerobic exercise; a constitutional.
 * 2)  An example that serves as an introduction.