Synonyms for the expression "right-o" can be utilized to convey agreement, confirmation, or understanding. Similar phrases include "absolutely", "certainly", "indeed", and "agreed". Instead of saying "right-o", one might opt for "exactly", "precisely" or "correct". These alternatives convey a sense of validation, acknowledging that the information or statement provided is accurate. Other informal phrases with a similar meaning include "you got it", "no doubt", and "for sure". Utilizing these synonyms adds variety and allows for a more diverse range of expressions when affirming someone or indicating comprehension.