Green’s Dictionary of Slang

maids adorning n.

[rhy. sl.]

the morning.

1859		Hotten Dict. of Modern Sl. etc. 144: MAIDS A DAWNING (I suppose my informant means maids adorning), the morning.
1864, 1867, 1870		Hotten Sl. Dict. [as cit. 1859].
1873		Sl. Dict.