2. Noun. A device or mechanism for clearing obstructions in a pipe. ¹
3. Noun. (sports) A practice event; a warm-up. ¹
4. Noun. (figuratively) A brisk walk or other aerobic exercise; a constitutional. ¹
5. Noun. (figuratively) An example that serves as an introduction. ¹
¹ Source: wiktionary.com