Definition of jim-jams in English:

jim-jams

plural noun

informal
  • A fit of depression or nervousness.

    ‘prerace jim-jams’
    worry, concern, apprehension, apprehensiveness, consternation, uneasiness, unease, fearfulness, fear, disquiet, disquietude, perturbation, fretfulness, agitation, angst, nervousness, nerves, edginess, tension, tenseness, stress, misgiving, trepidation, foreboding, suspense
    View synonyms

Origin

Mid 16th century (originally denoting a small article or knickknack): fanciful reduplication. The current sense dates from the late 19th century.

Pronunciation:

jim-jams

/ˈjim ˌjamz/