pickthird base . third base {n.} The base to be touched third in baseball. He reached third base standing up on a long triple. Categories: add yours noun Source: A Dictionary of American Idioms 'third base' on video Third base with Matt Chapman How To Play 3rd Base - 7 Easy Tips Who's on First? [POV Baseball] 3rd Base sort: relevance, mode: exact match, q: "third base", maxResults: 4, videoEmbeddable: true, videoSyndicated: true, safeSearch: strict, type: video Subscribe to: American IdiomsEnglish Slang Leave my opinion