#1 sideline n. [out of bounds] a line that marks the side boundary of a playing field. wn
#2 sideline v. remove from the center of activity or attention; place into an inferior position; "The outspoken cabinet member was sidelined by the President". wn
#3 sideline n. an auxiliary line of merchandise. wn
#4 sideline n. [avocation, by-line, hobby, pursuit, spare-time activity] an auxiliary activity. wn
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