There's a word that sounds similar to rido and means right, as in correct. I've heard it in a movie. What is it?
It doesn’t sound like "rido" — it sounds like "righto", because that’s what it is. Per the paywalled OED entry:
A. int. colloquial. Expressing acknowledgement, assent, or compliance; ‘OK!’, ‘that's fine’, ‘agreed’. Cf. righty-ho int.
It means exactly the same thing Right! means. Their earliest citation is from Kipling:
- 1893 R. Kipling Many Inventions 374
‘What’s the matter? Hit?’ said Bai-Jove-Judson. ‘No, I’ve just seized of your roos-de-gare. Beg y’ pardon, sir.’ ‘Right O! Just the half a fraction of a point more.’ The wheel turned under the steady hand.
Notice that they reference righty-ho, which sounds like "righteo". That’s pretty common, too. Again, means the same ol’ thing by any other nameo.