<p><strong>Verb:</strong></p><ul><li>to make slow; delay the development or progress of (an action, process, etc.); hinder or impede.</li><li>Synonyms: check, obstruct.</li><li>Antonyms: accelerate.</li></ul><p><strong>Noun:</strong></p><ul><li>a slowing down, diminution, or hindrance, as in a machine.</li><li>Slang: Disparaging and Offensive. A contemptuous term used to refer to a person who is cognitively impaired; a person who is stupid, obtuse, or ineffective in some way.</li><li>Automotive, Machinery: an adjustment made in the setting of the distributor of an internal-combustion engine so that the spark for ignition in each cylinder is generated later in the cycle.</li></ul>