Backing up refers to a driverOK, so we all know what the driver is, right. I've always liked the description that F1 drivers are like... There's more... slowing down so the cars behind him get held up or begin to bunch up.
You may hear reference to this during a qualifyingQualifying (Quali) is a one-hour session used to determine pole position and the order the cars will line up behind... There's more... session where a driver is looking for a clear track ahead, or when the cars come to the start gridThe starting order of the race is typically determined by qualifying, however, with the introduction of sprint races, the result... There's more... and a driver down the gridThe grid is a reference to the starting order of the race is typically determined by qualifying, however, with the... There's more... is happy for the cars at the front to lose tyre heat by waiting, or in a race where a driver may hinder the car behind to allow his teammate to get further ahead.
There are rules that control most of these scenarios, but the drivers and teams know exactly where the limits are and will use the rules to maximise their advantage.