Your teacher assigns you an essay and you write down anything that can be said about the subject.
You are satisfied, but the word count doesn't reach the required minimum.
So you use lousy tricks like substituting "in other words" with "to put it another way", and generally rewriting each sentence in the most verbose way possible without increasing the conveyed concepts.
Bingo: the essay is much worse than before but it's now "long enough".
In Italian we use the derogatory idiom "allungare la brodaglia" which can be literally translated by "to water down the broth" or "to water down the slop" meaning to increase the use of unnecessary words to make the essay look longer but without adding any concept to it.
Is there an equivalent derogatory idiom in English?
So far I only found "to stretch out the meeting" to mean "to talk and talk in order to make the meeting longer than necessary".
In my case can I use "to stretch out the essay" or "to stretch out the slop" to mean "to add unnecessary words to the essay with the only purpose of increasing the word count, even at the expense of the readability of the essay"?
Any other idiom suggested?