When you speak, sweet, I'd have you do it ever; when you sing, I'd have you buy and sell so; so give alms; Pray so; and, for the ordering your affairs, To sing them too: when you do dance, I wish you A wave o' the sea, that you might ever do Nothing but that; move still, still so, and own No other function: each your doing, So singular in each particular, Crowns what you are doing in the present deeds, That all your acts are queens.
There are no more uses of "function" in the play.
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I can't function on less than six hours of sleep a night; and I do best on nine.
My brain does not function as well when I'm under stress.