11. trail to change gradually or wander from a course, so as to become weak, ineffectual, etc. (usu. fol. by off or away): Her voice trailed off into silence.
17. trail the track, scent, or the like, left by an animal, person, or thing.
18. trail something that is trailed or that trails behind, as the train of a skirt or robe.
19. trail a stream of dust, smoke, light, people, vehicles, etc., behind something moving.
20. trail either of two rearward-facing parts of an artillery piece, spread out on the ground for support when the piece is fired.
Etymology: (1275–1325; ME: to draw or drag in the rear; cf. OE træglian to tear off, c. MD traghelen to drag)
Definition of 'trail'
Princeton's WordNet
1. (noun)trail a track or mark left by something that has passed "there as a trail of blood"; "a tear left its trail on her cheek"
2. (noun)trail a path or track roughly blazed through wild or hilly country
3. (verb)lead, track, trail evidence pointing to a possible solution "the police are following a promising lead"; "the trail led straight to the perpetrator"
4. (verb)drag, trail, get behind, hang back, drop behind, drop back to lag or linger behind "But in so many other areas we still are dragging"
5. (verb)chase, chase after, trail, tail, tag, give chase, dog, go after, track go after with the intent to catch "The policeman chased the mugger down the alley"; "the dog chased the rabbit"
6. (verb)trail, shack move, proceed, or walk draggingly or slowly "John trailed behind his class mates"; "The Mercedes trailed behind the horse cart"
7. (verb)trail hangdown so as to drag along the ground "The bride's veiled trailed along the ground"
8. (verb)trail, train drag loosely along a surface; allow to sweep the ground "The toddler was trailing his pants"; "She trained her long scarf behind her"