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Phrase(s): *under one’s belt
1. Fig. eaten or drunk and in one’s stomach. (Fig. on the image of swallowed food ending up under one’s belt. *Typically: get something ~; have something ~.) • I need to have something filling under my belt. I’ve had it with just soup. • I want to get a nice juicy steak under my belt. 2. Fig. achieved; counted or scored. (Fig. on Q. *Typically: have something ~.) • Minnie has over four hundred wins under his belt. • This fighter pilot has over 20 kills under his belt. 3. Fig. learned; mastered. (Fig. on Q. *Typically: get something~.) • Finally, she got good painting techniques under her belt. • When I get the right procedures under my belt, I will be more efficient.
McGrawhill's American Idioms And Phrasal Verbs