The spelling of the word "most crouched" follows English phonetic rules. The word "most" is spelled as /məʊst/ and the word "crouched" is spelled as /kraʊtʃt/. When combined, the sound of the "o" in "most" becomes a schwa sound while the "ch" in "crouched" is pronounced as /tʃ/. Therefore, the correct spelling for this phrase is "most crouched". It's important to understand IPA phonetic transcription to be able to pronounce words correctly and accurately when speaking or writing in English.
"Most crouched" is not a standard English word or phrase, and therefore it does not have an established etymology. "Crouched" is the past tense and past participle form of the verb "crouch", which means to bend down low with the knees bent and the upper body close to the ground. However, "most crouched" is not a common construction in English language usage. If you provide more information or context, I can try to assist you further.