Green’s Dictionary of Slang

1. a bad throat, a clearing of the throat.

1948

J. O’Connor Come Day – Go Day (1984) 11: ‘There you are,’ he cried. ‘Sixty-five in a lock of days and as supple’ – a plocker of coughing seized him. [Ibid.] 37: Change into these old things [...] before you catch a plocker that you’ll carry to the grave.

2. a smoky atmosphere.

1997

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