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Definition of first base noun from the Oxford Advanced Learner's Dictionary

first base

noun
 
/ˌfɜːst ˈbeɪs/
 
/ˌfɜːrst ˈbeɪs/
 Idioms
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  1. (in baseball) the first of the four positions that players must reach in order to score points; the position of the player on the defending team near first base
    • He didn't make it past first base.
    • He hasn't played first base yet this season.
    Topics Sports: ball and racket sportsc1
  2. (informal, especially North American English) the first stage of sexual contact, usually referring to kissing
    • He had never even got to first base with a girl.
    Topics Family and relationshipsc2
Idioms
not get to first base (with something/somebody)
  1. (informal, especially North American English) to fail to make a successful start in a project, relationship, etc.; to fail to get through the first stageTopics Difficulty and failurec2
See first base in the Oxford Advanced American Dictionary
Check pronunciation: first base

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adverb
 
 
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