In the sentence, "Queremos daros una pequeño parte para el viaje a España" (from Olly Richards' Short Stories in Spanish for Beginners, Volume 1) what is the "os" in "daros" for, if "dar" means "to give"?
It's the second person plural object pronoun 'os' (as opposed to the subject pronoun 'vosotros'). It means 'you (plural)'. You would also use it where in English you might use 'to you' or 'for you' etc.
When such a pronoun occurs directly after an infinitive verb (or a gerund, or a positive command), it attaches to the end of the verb (this is called enclisis).
- Queremos daros - We want to give you (pl.)
- Queremos darte - We want to give you (sing.)
- Queremos darle - We want to give him