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Adjective: up the stick
Usage: Brit, informal
  1. Carrying developing offspring within the body or being about to produce new life
    - pregnant, up the duff [Brit, informal], preggo [Austral, NZ, informal], up the spout [informal], preggers [informal]

See also: big, enceinte [archaic], expectant, gravid [technical], great, heavy, large, with child