The spelling of "hast care" can be tricky due to the pronunciation of the "s" sound. In IPA phonetic transcription, the word would be written as /hæst kɛr/, with a glottal stop replacing the "s" sound. This is because "hast" is an archaic form of "have" that is pronounced with a glottal stop in many dialects. Therefore, the correct spelling is "hast care," although it may be pronounced as "ha' care." It is important to remember that correct spelling and correct pronunciation do not always align.
The phrase "hast care" is not a common English expression and does not have a specific etymology. "Hast" is an archaic form of the word "have" that was used in Middle English, and "care" means concern or worry. However, "hast care" doesn't have a well-established historical usage or specific meaning in modern English. It could potentially be a combination of words used within a specific context or a personal phrase with individual significance. Without additional context, it is difficult to determine its precise origin or intended meaning.