- the side or border of a trail.
- on or near the side of a trail.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for trailside
Together they started for the trailside, and the wooded slope leading to the gap.
It was also impossible for the car to go around the tree, on account of the rocky ground at the trailside.
Just as Hank disappeared, a form tore through the bushes close to the trailside and rushed for the car.
And ahead of him, and amongst the trailside bush, he beheld nothing but this rising flood.The Twins of Suffering Creek