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What's the meaning of this phrase in this following sentence, 'This is a good book. Or is it?'
As a learner of English, I've recently come across some phrases which can't be found in any of the good dictionaries. So with the meaning of this phrase, could somebody please suggest about a Source to learn all these phrases or other rare words, and most importantly to learn perfect use of Grammer?
"Or is it?" is an idiomatic phrase used to cast doubt on the previous statement.
Sometimes it is stated as a new sentence as in your example, or sometimes as a prefix to the statement it questions. For example, "The End... Or Is It?" is a popular 'ending trope', that is a way to conclude a fictional story in a way that seems final but leaves possibility for a future continuation.
In your example, "it's a good book" is a statement that the book is good. "Or is it?" then questions that opinion. If your example was used to begin a book review, for example, the statement that it is "good" may represent the popular opinion, and the article may go on to critically examine both the book and the widespread opinion.
