Copy that vs Understood

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

Copy that

InformalTop 2,000 (common)

Understood

Top 1,000 (very common)
Most formal: UnderstoodMost common: Understood
 Copy thatUnderstood
Pronunciation🇬🇧 //ˈkɒpi θæt//🇺🇸 //ˈkɑpi θæt//🇬🇧 //ˌʌndəˈstʊd//🇺🇸 //ˌʌndərˈstʊd//
MeaningI understand you or I will do that.To know or comprehend something.
ExampleWhen you’re ready, just say 'copy that'.After the explanation, I finally understood the problem.
RegisterInformalNeutral
How commonTop 2,000 (common)Top 1,000 (very common)
Collocationscopy that, over, copy that, roger, copy that, understoodfully understood, clearly understood, never understood, easily understood
Antonymsignore that, disregard that, neglect thatmisunderstood, confused, ignorant
Common mistakesUsing in formal contexts., Confusing with 'copy' as a verb., Not responding after saying 'copy that'.Confused with 'understand' in different tenses., Using 'understood' in present tense situations., Mispronouncing the word, leading to misunderstandings.
Usage notesUsed to acknowledge understanding in casual conversations, often in radio communication. Avoid in formal writing or speeches.Use 'understood' in past tense contexts or when confirming comprehension. Avoid in formal writing where 'comprehended' may be preferred.

See it in real clips

Copy that
Understood

Frequently asked questions: Copy that vs Understood

What's the difference between Copy that and Understood?

Copy that: I understand you or I will do that. Understood: To know or comprehend something.

Which is more formal: Copy that and Understood?

Understood is the most formal of these.

Which is more common: Copy that and Understood?

Understood is the most common in everyday English.

Can you show an example of each?

Copy that: When you’re ready, just say 'copy that'. Understood: After the explanation, I finally understood the problem.

Can I use Copy that and Understood interchangeably?

Not always. Copy that and Understood 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