Also bumboo, bombo. [Cf. It. bombo a child’s word for drink (Tommaseo and Bellini).] ‘A liquor composed of rum, sugar, water, and nutmeg’ (Note to Rod. Random); also other alcoholic mixtures.

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1748.  Smollett, Rod. Rand., xxxiv. A table well stored with bumbo and wine.

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1756.  T. Turner, Diary, 28 April, in Parish, Sussex Gloss., s.v., One bowl of punch and two muggs of bumboo.

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1867.  Smyth, Sailor’s Word-bk., Bombo, weak cold punch.

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a. 1886.  Northumb. Song, in N. & Q., 6 March, 195. The pitmen and the keelman … drink bumbo made of gin.

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