IPA: //ˈbækˌlæʃər//
KK: /ˈbækˌlæʃər/
A person who takes part in a strong negative reaction or criticism against something, often in response to a change or trend.
The backlasher voiced their concerns during the meeting about the new policy changes.
Backlasher → The word is formed from "back" (from Old English "bæc", meaning the rear part) and "lash" (from Old English "lascan", meaning to strike or hit). A backlasher refers to someone who strikes back or retaliates, particularly in response to criticism or attack.
Think of someone at the 'back' who 'strikes' back when attacked — that's why a backlasher is someone who retaliates.