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opener

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opener/ˈoʊpənɚ/noun
pluralopeners
opener
/ˈoʊpənɚ/
noun
pluralopeners
Learner's definition of OPENER  
[count]
: a tool, device, or machine that is used to open something
: the first game, performance, etc., in a series

for openers

informal
: as the first thing to be thought about or said : to begin with
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