Meaning

Available at all times.

بیست و چهار ساعت، هر روز هفته/همیشه

Example:

1) Macdonald is a great resturant  because they are open twenty-four seven.

2) If a business doesn’t provide twenty-four seven customer support, they will not succeed.

3) You better be careful because I’m going to be watching you twenty-four seven.

4) They’re available twenty four hours a day, 365 days a year.

A short dialog with Twenty-four seven

A: “What web hosting place do you recommend?”

B: “Most of them are pretty good. Just make sure they have twenty-four hour technical support.”

A: “All of them have twenty-four seven support. It’s a necessity these days.”

Other Common Sentences

– The cops are watching this area all-day every-day.

– There’s no way to cross the border because they’re constantly monitoring all the passage ways.

Origin

Seven days and twenty four hours.