How to Say "to pad" in Spanish
The Spanish word for “to pad” is “engordar” — B2 level.
English → SpanishB2
verbB2
making something look bigger, like a resume or bill

Examples
Ese negocio sirvió para engordar su cuenta bancaria.
That business served to swell his bank account.
El autor intentó engordar el libro con capítulos innecesarios.
The author tried to pad the book with unnecessary chapters.
Engordó su currículum con mentiras.
He padded his resume with lies.
Using 'Engordar' for Inanimate Objects
Even though 'gordo' usually refers to living things, this verb works perfectly for things like bank accounts or lists that are getting 'fatter' or larger.
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