This is the 16689th most frequent Russian word.
скажете
"Say" or "will you say" (formal or polite request).
In this sentence, 'скажете' reflects future tense in the second person plural, used to ask for an opinion about the book.
Что вы скажете о новой книге?
What will you say about the new book?
Here, 'скажете' appears in a conditional clause, implying a hypothetical action by the addressed people or person (plural or formal singular).
Если скажете, я вас поддержу.
If you say it, I will support you.
The word 'скажете' signals a future action tied to readiness, directed towards the listener(s) in a respectful or plural form.