Right away vs We must go at once

When to use each in English, with meaning, register, and examples.

Right away

Top 2,000 (common)

We must go at once

Top 2,000 (common)
 Right awayWe must go at once
Pronunciation🇬🇧 //raɪt əˈweɪ//🇺🇸 //raɪt əˈweɪ//🇬🇧 //wiː mʌst ɡoʊ æt wʌns//🇺🇸 //wi mʌst ɡoʊ æt wʌns//
MeaningImmediately or without delayWe need to leave immediately.
ExamplePlease send the report right away.We must go at once if we want to catch the train.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
Collocationsact right away, respond right away, call right awaygo at once, must go, leave at once
Common mistakesUsing 'right away' in a formal context where a more formal phrase is needed., Confusing it with 'right of way,' which means priority in traffic., Using it without a verb, as it normally needs context.Confused with 'at once' vs 'right away', Using 'we must go at once' in casual contexts where simpler phrases suffice, Overusing the phrase in non-urgent situations
Usage notesTypically used in both written and spoken English to indicate urgency. Can be polite or direct depending on context.Use this phrase to express urgency. It's appropriate in both spoken and written contexts, especially when time is a factor.

See it in real clips

Right away
We must go at once

Frequently asked questions: Right away vs We must go at once

What's the difference between Right away and We must go at once?

Right away: Immediately or without delay We must go at once: We need to leave immediately.

Can you show an example of each?

Right away: Please send the report right away. We must go at once: We must go at once if we want to catch the train.

Can I use Right away and We must go at once interchangeably?

Not always. Right away and We must go at once are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

Related comparisons