rellenar
to fill in; to stuff
verb rreh-yeh-NAHR Rare
Origin: From re- + llenar (to fill), from Latin plēnus (full).
Also means
to top up; to complete (a form)
Usage Note
Rellenar covers both culinary stuffing (rellenar un pimiento — to stuff a pepper) and administrative form-filling (rellenar un formulario). The reflexive rellenarse can mean to refill or to become stuffed. Do not confuse with llenar (to fill a container) — rellenar implies re-filling or filling a cavity/blank.
Examples
"Hay que rellenar el formulario con letra clara."
Natural Translation
You need to fill in the form in clear handwriting.

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