The Collaborative International Dictionary
Upsitting
Upsitting \Up"sit`ting\, n. A sitting up of a woman after her confinement, to receive and entertain her friends. [Obs.]
To invite your lady's upsitting.
--Beau. & Fl.
Wiktionary
upsitting
n. (context obsolete English) A sitting up of a woman after her confinement, to receive and entertain her friends.