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It is used metaphorically. Presumably, if an animal has just past, its trail is still warm, and signs like foot prints, or scent, or pieces of fur will still be there to indicate where the animal went. It will be possible to track the animal.
A long time later, when the trail is "cold", the traces of the animal will have disappeared, and you will not be able to track it.
When trail of a crime "goes cold", time has past and useful evidence has disappeared. Some of the evidence that has disappeared might be witnesses' memories of what happened and what they saw, but the reference is to all the things that make it more difficult to solve a crime after time has gone by.
What else can I help you with?
What does the idiom lose your marbles mean?
The idiom, "You lost your marbles," means that you've gone crazy.
What does the idiom 'in on it' mean?
in on it means you know whats going on or about a certain subject. "when it comes to penguins I am in on it!" i might say
What does rubberneck mean Idiom?
It means to turn one's neck to see what is going on. Often used to describe drivers going past an accident.
What does the idiom itchy nose mean?
It is not an idiom, it means your nose is itching.
What does idiom mean in poetry?
idiom means expression like a page in a book
What does the idiom made your blood run cold mean?
get scared or terrified
What does the idiom fairplay mean?
Fair play is not an idiom - it means exactly what it says. Things are going along fairly.
What does the idiom rain or sunny mean?
It's not an idiom. It means just what it says -- it's either going to rain that day, or it will be sunny.
What does the idiom 'out in the cold' mean?
It means that you were "coldly" ignored or rebuffed, as though someone shut the door and left you outside in the cold weather.
What does the idiom lose your marbles mean?
The idiom, "You lost your marbles," means that you've gone crazy.
What does getting places mean in American slang?
Getting places is no idiom that I've heard of. Going places is an idiom. It means you are successful, moving up in the world.
What does the idiom even if it kills you mean?
This isn't an idiom because it means just what it seems to mean - you're going to do something even if it kills you. Of course, most people don't really mean that, so it IS an exaggeration or hyperbole.
What does the idiom shes colder than ice mean?
It's not an idiom because it means just what it looks like - someone is very cold. In this context, you would think of the alternate meaning of cold, which is unemotional or unapproachable. When you see "as ___ as ___" or "___er than ___" you are dealing with a simile.
What does the idiom 'in on it' mean?
in on it means you know whats going on or about a certain subject. "when it comes to penguins I am in on it!" i might say
What does rubberneck mean Idiom?
It means to turn one's neck to see what is going on. Often used to describe drivers going past an accident.
What does idiom you are dead meat mean?
They are implying that they have "killed" you - you are in big trouble with them, and they are going to make you pay for whatever you just did to them.
What does the idiom 'he has got' mean?
"He has got" means "he has." This can mean "he owns it," or "he is holding it," or "he has control of it." You might hear "He has got every CD that band has ever made," or "He has got a cold."
