In what sentence? A lead is a clue that might help you solve a mystery. A lead is also a strap that is attached around the neck of your dog when you take it for a walk.
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In what sentence?
A lead is a clue that might help you solve a mystery.
A lead is also a strap that is attached around the neck of your dog when you take it for a walk. You hold the other end of the lead.
Without sentences it's hard to know what 'on a lead' means.
Please provide at least one sentence when you post this kind of question.
CJ