Questions & Answers about ¿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:
Because the sentence is addressing you informally, Spanish uses dejas.