DictionaryRoot: line
English
line
occupation, branch of business
1 / 1
noun / verb
sideline
SYDE-lyne/ˈsaɪdlaɪn/
A line marking the lateral limit of a playing area.
Etymology
A line can mean a course of business or occupation, while side marks something apart from the main course. A sideline is thus a secondary pursuit alongside one's regular work.