Usage Note
Decir is highly irregular: digo (yo), dije (preterite), dicho (past participle). The command forms differ by register: di (tú informal), diga (usted formal). The idiom es decir ('that is to say') is a ubiquitous discourse marker in both spoken and written Spanish.
Examples
"¿Qué dijiste?"
Natural Translation
What did you say?

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