Green’s Dictionary of Slang

Ditch, the n.1

[the Mahratta Ditch, built by the East India Company in 1742 to protect Calcutta from the Mahratta tribesmen, it ran for 8km (3 miles) but the work was never finished]

1. [late 19C] Calcutta; thus ditcher, an inhabitant of Calcutta; also attrib.

2. [1980s] the Suez Canal.

3. [2000s] (N.Z.) the Tasman Sea, which divides New Zealand from Australia.

In derivatives

Ditcher (n.) (also Calcutta ditcher)

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