"sideline" in the noun sense
1. sideline, out of bounds
a line that marks the side boundary of a playing field
an auxiliary line of merchandise
3. avocation, by-line, hobby, pursuit, sideline, spare-time activity
an auxiliary activity
"sideline" in the verb sense
remove from the center of activity or attention place into an inferior position
"The outspoken cabinet member was sidelined by the President"
Source: WordNet® (An amazing lexical database of English)
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