something or someone that disables; a factor, agent, or person that causes loss of function or ability.
From 'disable' plus the agent noun suffix '-er,' which creates nouns for people or things that perform an action. The '-er' suffix is one of English's most productive tools for creating agent nouns.
A 'disabler' could be a virus (disabling your body), a malfunction (disabling a machine), or even a bad policy (disabling a community)—showing how the same word-forming logic creates nouns for very different kinds of agents!
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