yeah, no

Interjection

1. (Australia, California, New Zealand, colloquial, emphatic, especially) Used sarcastically to answer "no" to a question where the negative answer should have been obvious.
2. (US, colloquial) A softened negative response to a question or statement that seems plausible but is not factual.
   • "Look at those clouds; it might rain." "Yeah, no, the weatherman says it won't rain until at least next week."
3. (colloquial) An agreement that the answer is negative.
   • "I hope you weren't expecting us to finish it this week." "Yeah, no, that's fine — I figured it might not be that quick."
4. An agreement; the “yeah” functions as affirmation, while the “no” could be replaced by the phrase “don’t worry.”