The word "hushed" is commonly spelled with only one 'h', but some phrases add an extra 'h' for emphasis. "Hushhushed" is one such phrase, and its spelling follows the rules of English phonetics. The first syllable, "hush", is pronounced with an 'h' sound and a short 'u' sound, while the second syllable, "-ed", is pronounced as a long 'e' sound followed by a 'd' sound. Thus, the IPA transcription for "hushhushed" would be /ˈhʌʃhʌʃt/.
The word "hush" is derived from Old English "hyscan", meaning "to be silent or still". The addition of "-ed" to form "hushed" follows the regular past participle formation in English.
The word "hush" itself is an imitative word, derived from the sound made when people try to quieten someone or something by saying "shhh" softly. This imitative origin is common in many languages where onomatopoeic words are used to describe sounds or actions.