* It's a misspelling: There might be a similar-sounding word you're trying to remember. Could you check your spelling?
* It's a regional term: It could be a word from a specific dialect or region, making it difficult to translate without knowing the context. Could you provide more details about where you encountered this word?
* It's a made-up word: Sometimes people create words for specific purposes, like in a fictional story.
Please provide more information so I can help you figure out what "Dhachaidh" means.