come on line

come on line

or

go on line

mainly AMERICAN
COMMON If a plan, project or product comes on line or goes on line, it starts to operate fully or be available to be used. This plane was the first to be lost since the popular model came on line in 1982. The government, faced with a major energy crisis, is eagerly waiting for another reactor to go on line. Note: You can also just say that something is on line if it is operating or available. You'll have that machine back on line by nine at the latest.
See also: come, line, on