Green’s Dictionary of Slang

rant n.

[Scot./dial. rant, boisterous merry-making]

a spree.

[UK]Mercurius Fumigosus 38 14–28 Feb. 303: The Rant grew so high between them in singing, roaring & tearing the ground, that all the Neighbours (not being unused to hear any such Revell in that place) were, much amazed.