1. Located or occurring on an established path or trail, especially in hiking or outdoor activities
The on-trail portion of the hike was well-maintained and easy to follow.
A parte da trilha na trilha da caminhada era bem mantida e fácil de seguir.
2. Following an established route or schedule as planned
The project is on-trail for completion by the deadline.
O projeto está na trilha para conclusão dentro do prazo.