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(baseball) The base opposite home plate in a baseball infield. examples
(singular only, US, colloquial) Touching a partner under his or her clothes, without having sex. quotations examples
How about this? French kissing. Seven minutes in heaven, culminating in second base.
2011 November 3, “The Isolation Permutation”, in The Big Bang Theory, season 5, episode 8, spoken by Amy Farrah Fowler (Mayim Bialik)