Back up
Back up verb - Establish as valid or genuine.
Confirm is a synonym for back up in support topic. In some cases you can use "Confirm" instead a verb "Back up", when it comes to topics like substantiate.
Confirm
Confirm verb - To give evidence or testimony to the truth or factualness of.
Usage example: several eyewitnesses who can confirm the defendant's account of what happened
Back up is a synonym for confirm in prove topic. You can use "Back up" instead a verb "Confirm", if it concerns topics such as substantiate, corroborate.
Mutual synonyms
Both terms in one sentence
- Not So Stoic: When the Sarrazin bros confirm that the ranch indeed has oil, the normally chill Louise has an outburst of joy but then checks herself and quickly puts her guard back up.
- In Hotline Miami, when you knock down an enemy with a punch, door or thrown weapon, you need to confirm the kill by ground-and-pound or the enemy will just get back up.
Source: Once Is Not Enough
Cite this Source
Confirm and Back up. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/back_up/confirm
Back up & Confirm. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/back_up/confirm>.
Confirm or Back up. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/back_up/confirm.
Google Ngram Viewer shows how "back up" and "confirm" have occurred on timeline