Simple past tense and past participle of open.(verb)
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Use "opened" in a sentence
""And I opened -- _opened_ mind you, with four messenger boys, pat!""
"There is a _supply_-cock, opened and an _escape_-cock closed, and an escape-cock _opened_ and a supply-cock _closed_, at each end of the tube, _every time the lever is moved_."
"The term opened with high anticipation because the justices seem likely to take up the health care overhaul now that both the administration and opponents of the law have filed Supreme Court appeals."