This is the 12642nd most frequent Turkish word.
imiş
"Imiş" is a Turkish verb suffix indicating hearsay, inference, or reported past tense, meaning "it is said" or "apparently."
İmiş is used to indicate that the speaker deduced or inferred this information (retrospective observation).
O bugün erken gelmiş, çok kar yağmış demek ki.
He came early today; it seems there was a lot of snow.
In this sentence, 'imiş' (here as -muş) conveys the speaker's indirect knowledge or revelation based on what was learned or deduced.
Bu bilgi doğruymuş ama yanlış anlamışız.
This information seems to be correct, but we misunderstood it.
Here, 'imiş' shows that the statement about the book is based on second-hand information or hearsay.