Learn Italian: Lascia perdere, non è importante. - Let it go, it is not important.

The phrase lasciare perdere is a very common idiom. While lasciare means "to let" or "to leave" and perdere means "to lose", together they form a set phrase meaning "to let it go", "to forget about it", or "to drop it". It is a great example of the permissive construction (lasciare + infinitive) acting as a single concept.

Why does the verb lascia end in an -a here?

This is the informal imperative (command) form for tu. For regular -are verbs like lasciare, the affirmative tu command ends in -a. This can be tricky because it looks exactly like the lui/lei (he/she) present tense form, rather than the normal tu present tense form (lasci).

Where is the word for "it" in lascia perdere?

In English, we say "let it go" or "forget it", which requires a direct object pronoun. In Italian, the idiom lasciare perdere stands perfectly on its own without needing a pronoun like lo (it). You can just say lascia perdere to tell someone to drop a subject.

Why is there no word for "it" before non è importante?