Topic: GEOGRAPHY
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trail2 [countable]
1SG a rough path across countryside or through a forest : 
The trail led over Boulder Pass before descending to a lake.
The trail led over Boulder Pass before descending to a lake.2 a long line or a series of marks that have been left by someone or something
3 a series of unpleasant situations or feelings that have been left by someone or something
trail of He left a trail of broken hearts and broken promises.
He left a trail of broken hearts and broken promises.4 a sign that a person or animal has been in a place, used for finding or catching them : The hunters lost the tiger's trail in the middle of the jungle. Police tracked him to Valencia and there the trail went cold (=they could not find any signs of him).
The hunters lost the tiger's trail in the middle of the jungle.Police tracked him to Valencia and there the trail went cold (=they could not find any signs of him).5 to be trying to find someone or something by getting information about them : industrial spies on the trail of technological secrets Police believe they are hot on the trail of a drug-smuggling gang (=they are close to finding them).
be on the trail of somebody/something
industrial spies on the trail of technological secretsPolice believe they are hot on the trail of a drug-smuggling gang (=they are close to finding them).6 all the places that a particular group of people visit for a particular purpose : a town on the tourist trail
a town on the tourist trail7 the set of things that someone does to achieve something :
