<p><strong>Verb (used with object):</strong></p><ul><li>to cause pain, uneasiness, or trouble to: Inside our own bodies lies the most powerful cure for what ails us—our immune systems. He thinks lowering taxes is the answer to all that ails our economy.</li></ul><p><strong>Synonyms:</strong></p><ul><li>distress</li><li>annoy</li><li>bother</li></ul><hr><p><strong>Verb (used without object):</strong></p><ul><li>to be unwell; feel pain; be ill: He's been ailing for some time.</li></ul>