Identify the idiom in the below sentence and its meaning.It was Rahul who first introduced the breakthrough idea of exhaust emission control, and shortly afterwards other researchers took a leaf out of it.

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An idiom is a phrase that has a meaning that is different from the literal meaning of the words used. For example, "kill two birds with one stone" is an idiom.


Identify the idiom in the below sentence and its meaning.<br /><strong>It was Rahul who first introduced the breakthrough idea of exhaust emission control, and shortly afterwards other researchers took a leaf out of it.</strong>