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verb
1 (intransitive, transitive always + adv/prep) if something trails behind you, or if you trail it behind you, it gets pulled behind you as you move along(+ across/in/through): She walked slowly along the path, her skirt trailing in the mud. | trail sth in/on/through: Rees was leaning out of the boat trailing his hand through the water.2 also trail along (intransitive always + adv/prep) to walk slowly, especially because you are tired or bored, and often following other people(+ behind/around): Susie trailed along behind her parents.3 (intransitive, transitive usually in progressive) to be losing in a game, competition, or election: The Democrats are still trailing in the latest poll. | trail (sb) by: At the end of the first half Bolton were trailing by two goals to nil.4 (T) to follow a person or animal by looking for signs that they have gone in a particular direction: Police trailed the gang for several days.—see also: trailer trail away/off phrasal verb (I) if someone's voice trails away or off, it becomes gradually quieter and then stops: She trailed off, silenced by the look Kris gave her. 2 noun (C)1 be on sb's trail to be finding out where someone has gone in order to find or catch them: Police believe they are on the trail of a dangerous killer. | be hard/hot on sb's trail (=be close to finding someone you are trying to catch)2 while the trail is still hot if you chase someone while the trail is still hot, you follow them soon after they have left3 the track or smell of a person or animal by which it can be hunted or followed: The hunters lost the tiger's trail in the middle of the jungle.4 a rough path across open country or through a forest: The trail led over Boulder Pass before descending to a lake.5 trail of blood/dust etc a line or series of marks left by someone or something that is moving: They left a trail of muddy footprints on the living room carpet. | trail of destruction (=damage left by a moving storm or army)6 a trail of broken hearts/unpaid bills etc humorous a series of unhappy people or bad situations all caused by the same person: He left a trail of broken hearts, of deserted women behind him.—see also: blaze a trail blaze 1 (4)
Longman dictionary of contemporary English. 2004.