# come online

idiom

Source: https://englishreference.com/idiom/come-online
Updated: 2026-08-10

## Meaning

To enter service or become active.

## Examples

- The new website will come online tomorrow.
- The factory will come online next month after the engineers finish testing the new machines.
- Once the massive power plant finally comes online, it will provide enough electricity to support the entire region for the next several decades.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.