noun. ['ˈsaɪdˌlaɪn'] an auxiliary activity.
noun. ['ˈsaɪdˌlaɪn'] an auxiliary line of merchandise.
noun. ['ˈsaɪdˌlaɪn'] a line that marks the side boundary of a playing field.
verb. ['ˈsaɪdˌlaɪn'] remove from the center of activity or attention; place into an inferior position.