I have read the following sentence:
Pensiamoci su domani
Does "su" add anything here or is it just idiomatic? Would "Pensiamoci domani" be wrong/not usual?
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Sign up to join this communitySu in this sentence means "about this (topic) ". Another equivalent phrase could be pensiamoci sopra domani that has the same meaning.
Could it be omitted? Yes, I don't think it is unusual to omit it (on my experience).