The difference between Come online and Online
Come online is also verb with the meaning: to enter service or become active.
Online is also adverb with the meaning: describes actions performed over the internet.
Online is also adjective with the meaning: describes a system which is connected (generally electrically) to a larger network. describes a generator or power plant which is connected to the grid. describes a computer which is connected to the internet or to some other communications service – i.e., not simply with the cable plugged in, but has established a connection to a larger network (e.g., by dialing up).
check bellow for the other definitions of Come online and Online
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Come online as a verb (idiomatic):
To enter service or become active.
Examples:
"It will be some time before the new factory comes online, and until then we can't fulfill demand."
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Come online as a verb (idiomatic):
To login to an Internet communication system, such as an instant messenger, online game or forum.
Examples:
"Come online later; I want to talk to you."
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Online as an adjective:
Describes a system which is connected (generally electrically) to a larger network. Describes a generator or power plant which is connected to the grid. Describes a computer which is connected to the Internet or to some other communications service – i.e., not simply with the cable plugged in, but has established a connection to a larger network (e.g., by dialing up).
Examples:
"Is this modem online?"
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Online as an adjective:
Available over, or delivered from, the Internet.
Examples:
"I prefer to read online newspapers."
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Online as an adjective:
Connected to the Internet.
Examples:
"I'll be online tonight, so I'll be able to reply to your email."
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Online as an adjective:
Available on a computer system, even if not networked.
Examples:
"Press the F1 key to access the online help."
"The program comes with an online manual."
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Online as an adjective:
Describes a system that is active, particularly building facilities (such as power) or a factory or power plant.
Examples:
"The power is online."
"Once this factory comes online, it will double car production in our country!"
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Online as an adverb:
Describes actions performed over the Internet.
Examples:
"He works online."