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Definition of Three-on-the-tree
1. Adjective. (idiomatic) On an automobile, describing the gearshift lever of a steering column-mounted three-speed manual transmission. ¹
2. Noun. (idiomatic) On an automobile (especially those produced from 1939 through the mid-1970s), a three-speed manual transmission whose gearshift lever is mounted on the steering column. ¹
¹ Source: wiktionary.com