Used attributively to modify another noun (e.g., "fold line").
Definitionen
Attributive: able to be folded or designed to fold up for storage or transport. She packed a fold stroller for the trip.
Postpositive, preceded by a numeral: having a specified number of parts or multiplied by that amount. Output from the plant was five fold after the upgrades.
Synonyme
increased (as in 'increased X-fold')