Disclose vs Open up

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

Disclose

Formal Top 3,000 (common) C1 verb

Open up

Top 1,000 (very common)

Most formal: Disclose Most common: Open up

	Disclose	Open up
Pronunciation	🇬🇧 //dɪsˈkləʊz// 🇺🇸 //dɪsˈkloʊz//	🇬🇧 //ˈəʊ.pən ʌp// 🇺🇸 //ˈoʊ.pən ʌp//
Meaning	To make something known or public	To make something available or to start a conversation.
Example	The company decided to disclose its financial results to the public.	She decided to open up about her childhood experiences.
Register	Formal	Neutral
How common	Top 3,000 (common)	Top 1,000 (very common)
CEFR level	C1	-
Part of speech	verb
Collocations	disclose information, disclose a secret, disclose details	open up a discussion, open up about feelings, open up access, open up to someone, open up opportunities
Antonyms	conceal, hide	-
Common mistakes	Confused with 'clothe' - 'disclose' does not involve clothing., Incorrect verb form - using 'discloser' instead of 'disclose'.	Confused with 'open' – 'open up' suggests revealing more than just physically opening something., Using it without an object when it's needed – e.g., say 'open up the discussion' instead of just 'open up'.
Usage notes	Used primarily in formal contexts, such as legal or business environments. Avoid in casual conversation.	Use 'open up' in casual conversations to refer to sharing feelings or information. It's appropriate in both personal and some professional contexts, but avoid it in very formal situations.

See it in real clips

The Pitt › S1 E1

Waiting room, until a bed opens up.

Better Call Saul › S1 E1

Open up, officer of the court!

Succession › S1 E1

And until it opens up, Chief Operating Officer.

The Pitt › S1 E1

Waiting room, until a bed opens up.

Better Call Saul › S1 E1

Open up, officer of the court!

Open up

Frequently asked questions: Disclose vs Open up

What's the difference between Disclose and Open up?

Disclose: To make something known or public Open up: To make something available or to start a conversation.

Which is more formal: Disclose and Open up?

Disclose is the most formal of these.

Which is more common: Disclose and Open up?

Open up is the most common in everyday English.

Can you show an example of each?

Disclose: The company decided to disclose its financial results to the public. Open up: She decided to open up about her childhood experiences.

Can I use Disclose and Open up interchangeably?

Not always. Disclose and Open up 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.