|An English-Spanish Dictionary (Granada University, Spain), 14.4
under + Posesivo + belt
= en el haber de Uno.
Ex: With that accomplishment under his belt, he went to work for the NYPL in 1969 as a systems analyst.
|English Idioms WM 1.3a
under my belt
With an accounting course under my belt, I can do the bookkeeping.