ipecacuanha /ip-i-kak-ū-anˈə/

1. (sometimes shortened to ipecacˈ) the dried root of various S American plants, used as a purgative, emetic and expectorant
2. A plant from which this is obtained, chiefly Cephaelis or Uragoga (family Rubiaceae)

• knocked
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• knock for six
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• knock into a cocked hat
• knock into the middle of next week
• knock-knee
• knock-kneed
• knock-knees
• knock off
• knock on
• knock-on