way·side (wā'sīd') n. The side or edge of a road, way, path, or highway. adj. Situated at or near the side of a road, way, path, or highway: a wayside inn.
Fail to continue, drop out, as in At first she did well on the tour, but with all the pressure she soon fell by the wayside. This phrase appeared in William Tyndale's translation of the New Testament (1526; Luke 8:5).