Definition of shamus in English:

shamus

noun

North american
informal
  • A private detective.

    • ‘‘This isn't some tacky shamus [private eye] getting caught out,’ said one media executive.’
    • ‘The criminals are more interesting than the stoic shamus.’
    • ‘Chandler, to whom pulp fiction had come late in life, had written his first Marlowe novel, ‘The Big Sleep, ‘in 1939, followed by six more novels about the L.A. shamus.’
    • ‘Switchblade in hand, Polanski advances on the cornered shamus, chastising Gittes for being a ‘nosy guy.’’

Origin

1920s: of unknown origin.

Pronunciation:

shamus

/ˈʃeɪməs/