The expression "till blue in the face" means to continue doing something until it becomes pointless or ineffective. The correct spelling is 'till', which is short for 'until'. The 'i' sound in 'till' is pronounced as /ɪ/ in IPA phonetic transcription. 'Blue in the face' is spelled correctly as well. The 'u' sound in 'blue' is pronounced as /uː/ in IPA phonetic transcription. The phrase is mostly used in informal situations and can be traced back to the 19th century.
The phrase "till blue in the face" is an idiomatic expression usually used in informal settings to describe a person's persistent or futile attempts to convince or persuade someone of something. It means to argue, explain, or protest in an unremitting or exhaustive manner, often with great passion or intensity, but without achieving the desired outcome or changing the other person's opinion.
The origin of this phrase is uncertain, but its use dates back to the early 20th century. The word "blue" in this context is thought to refer to the color of one's face when they become exhausted or frustrated from incessantly talking or shouting. This implies that the person has talked so much that their face has turned blue, but still their efforts have not been successful.
The phrase "till blue in the face" is commonly used to emphasize the point that no matter how much or how long a person argues or tries to convince others, it is unlikely to produce the desired result. It connotes a sense of futility or hopelessness in the face of unyielding opposition or stubbornness.
Overall, "till blue in the face" serves as a metaphor for an individual's persistent or exhaustive efforts to change someone's opinion, despite the unlikelihood of success.