a plug for stopping the mudhole of a boiler.

See also: Mud

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.

References in periodicals archive

After the hole is cut, a mud plug or pig is pulled through to clean the hole.

Slurry, Dry Boring Discussed At GCTA Luncheon

ANGRY Cliftonville skipper Mickey Donnelly threatened to retire after suffering red-card agony during the Smirnoff Premiership mud plug against neighbours Crusaders at Solitude.\ Donnelly's dismissal, in the 54th minute along with Crues hotshot Crawford McRae, means the veteran must sit out Saturday's Irish Cup quarter- final against Carrick Rangers at Taylor's Avenue.

Football: Donnelly sees red over ref; CLIFTONVILLE 1 CRUSADERS 1

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Mud plug