| 1. | A line pertaining or attached to the side of a thing. | |
| 2. | A line of goods sold in addition to one's principal articles of trade; a course of business pursued aside from one's regular occupation. |
| Noun | 1. | sideline - a line that marks the side boundary of a playing field Synonyms: out of bounds |
| 2. | sideline - an auxiliary line of merchandise | |
| 3. | sideline - an auxiliary activity |
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