free run1
/ˈfriː rʌn/Winemaking
noun
Unfermented juice, or young wine which is at least partially fermented, derived from grapes which have been crushed but not yet pressed.
Origin
Mid 19th century. From free + run. Compare earlier free-running.
free-run2
/ˌfriːˈrʌn/verb
1 [no object] Of a signal generator, timepiece, etc.: to operate independently, without external influence or intervention. Also in extended use: to run freely, loosely, or easily.
2 [no object] Biology. Of a circadian rhythm: to operate in the absence of, or independently of, light or other external cues indicating the time of day. Also (of an organism): to maintain a circadian rhythm in this way.
Origin
1940s. From free + run.