¿Me dejas tu diccionario?

Me is an indirect object pronoun meaning to me. It shows who would receive the dictionary.

So the structure is basically:

me = to me
dejas = you lend / you let use
tu diccionario = your dictionary

Spanish normally puts this kind of pronoun before a conjugated verb, so me dejas is correct, not dejas me.

Dejas is the tú form of the verb dejar in the present tense.

The infinitive is dejar = to leave / to let / to lend, depending on context.

Present-tense forms:

• yo dejo
• tú dejas
• él/ella/usted deja

Because the sentence is addressing you informally, Spanish uses dejas.

Yes. That is a very common learner question, because dejar often first gets taught as to leave.

But dejar can also mean:

• to let
• to leave
• to lend / let someone use something

In ¿Me dejas tu diccionario?, it means Would you lend me your dictionary? or Will you let me use your dictionary?

In this kind of context, dejar algo a alguien means giving someone temporary use of something.

Yes, absolutely.

Prestar is the more direct verb for to lend, so:

¿Me prestas tu diccionario?
is also correct and very natural.

The difference is roughly:

• prestar = specifically to lend
• dejar = often to let someone have/use something, and in context it works like lend

In everyday Spanish, especially in casual speech, dejar is very common.

Because they are two different words:

• tu = your
• tú = you

So in this sentence:

• tu diccionario = your dictionary

If you wrote tú diccionario, that would be incorrect.

This accent mark changes the meaning, so it matters.

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

Here, dejas already tells you the subject is tú.

So:

• ¿Me dejas tu diccionario? = normal
• ¿Tú me dejas tu diccionario? = possible, but adds emphasis, contrast, or surprise

In neutral speech, leaving out tú is the most natural choice.

Spanish uses both:

• an opening question mark: ¿
• a closing question mark: ?

So a full written question looks like:

¿Me dejas tu diccionario?

The opening mark tells the reader from the beginning that the sentence is a question. This is standard in Spanish.

Yes, it is natural and polite enough in an informal situation, especially with a friend, classmate, or someone you know well.

If you want to sound a bit softer or more polite, you could say:

• ¿Me dejas tu diccionario, por favor?
• ¿Me puedes dejar tu diccionario?
• ¿Podrías dejarme tu diccionario?

If you need to be formal with usted, you would say:

• ¿Me deja su diccionario?

Because object pronouns like me, te, le, nos normally go before a conjugated verb.

So:

• ¿Me dejas tu diccionario? = correct

But if the verb is in the infinitive, the pronoun can attach to the end:

• ¿Puedes dejarme tu diccionario?

Both patterns are normal:

• me dejas
• puedes dejarme

This is a very common feature of Spanish pronoun placement.

In most of Spain, a rough pronunciation would be:

meh DEH-has too dik-thyo-NA-rio

A few useful notes:

• j in dejas is a strong throaty sound, not the English j
• c before i in diccionario is pronounced like th in think in most of Spain
• tu is pronounced too

Depending on the region of Spain, pronunciation can vary a bit, but that is a good standard Spain-Spanish guide.

Yes, if it is already clear which dictionary you mean.

Spanish often uses the definite article where English might use a possessive, but the choice depends on context.

• ¿Me dejas tu diccionario? = specifically your dictionary
• ¿Me dejas el diccionario? = the dictionary, when both speakers already know which one

Using tu makes the ownership explicit, so it is especially useful if there could be any ambiguity.