How to Say "to indent" in Spanish
The Spanish word for “to indent” is “sangrar” — C1 level.
English → SpanishC1
verbC1formal
typography or paragraph formatting

Examples
Debes sangrar la primera línea de cada párrafo.
You must indent the first line of every paragraph.
Technical use
While 'sangrar' is the action, the resulting space is called 'la sangría'.
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