Ma'anar ƙamus na kalmar "peristalsis" ita ce raunin tsoka da ba son rai ba wanda ke motsa abinci, chyme, ko wasu abubuwa ta hanyar narkewa. Ƙungiya ce mai haɗin gwiwa wanda ke taimakawa wajen motsa abubuwan da ke cikin tsarin narkewa tare da dukan tsawon ƙwayar gastrointestinal. Ana sarrafa wannan tsari ta hanyar tsarin juyayi mai zaman kansa kuma yana da mahimmanci don narkewa mai kyau da kuma sha na gina jiki. Peristalsis kuma yana iya faruwa a wasu sassan jiki, kamar mahaifar mahaifa a lokacin nakuda ko kuma masu ureter yayin jigilar fitsari.