Questions & Answers about Powiedz to słowo jeszcze raz.
Powiedz is the imperative form of powiedzieć, so it means say! when speaking to one person in an informal way.
It is also a perfective verb form, which fits a single complete action: say it once, say it now.
Related forms:
- powiedzcie = say! (to more than one person, or to a group informally)
- proszę powiedzieć = please say... (polite/formal)
Because Polish usually drops subject pronouns when they are obvious from the verb form.
So powiedz already tells you that the speaker is addressing you singular, informally. Adding ty is possible, but it would sound emphatic, contrastive, or sometimes irritated:
In normal speech, the pronoun is usually left out.