To sign a document
Encoding Strategies:
linguistic
firm
solid and fixed
+
-ar
verb suffix
Firmar means to sign and is related to the English word firm0, since you make something firm by signing it.
firmar
to sign
To put your signature on a document, making it official and binding.
Tienes que firmar el contrato antes del viernesYou have to sign the contract before Friday
Firmó el cheque y lo entregóHe signed the check and handed it over