For those who cannot display Arabic text, the suggested translation is pronounced HULM AL-YAQZHA.
You provided no context at all, so we do not know if you are asking about a noun or a verb, how the phrase is going to be used, etc. Therefore, the translation suggestion above is more of a lexical equivalent than a functional translation, since we do not know the context. There are other expressions that can fit better, depending on the context.
"daydream" is treated as one word in English, two words in Arabic.