Parties called crushes, in which persons have to stand almost stationary from the time of entering the suite of rooms to the time of leaving them.
“The night before I duly attended my whether to three fashionable
crowds, `perpendiculars' is the best name for them, for there is seldom
more than standing room.” —
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894