Medical Dictionary

ail

vt \ˈā(ə)l\

Medical Definition of AIL

:  to affect with an unnamed disease or physical or emotional pain or discomfort—used only of unspecified causes <what ails the patient>
intransitive verb
:  to become affected with pain or discomfort <was ailing from a cold>

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How to use a word that (literally) drives some people nuts.
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