Hi~ what's the "back by"mean?eg:back by popular demand...thx~

Question

Answer

It means that when something/someone [ a product or a  person] that has been taken away is given back,  because lots of people enjoyed or needed it.
Examples: The TV host was back by popular demand
The cereal  was back by popular demand.

Answer

back = has come back; had been brought back
popular demand = it is wanted by a large number of people

Because a lot of people have demanded it so, the song has come back onto the market.
The song is back by popular demand.

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