"Till blue the face" is a common expression meaning "until one turns blue in the face". The spelling can be a bit tricky, as "till" is pronounced like "til" (/tɪl/) and "blue" is pronounced like "bloo" (/blu/). The phrase is typically used to describe someone who repeats themselves excessively without making any progress or achieving their desired outcome. So, next time you hear someone saying "till blue the face", you know what it means!