Dinflation is the phenomenon that occurs at a restaurant when the diners realize the check
will likely be split
evenly and over order, causing the final check
to be inflated. The dinflation/over order is generally
late in the meal and may be an extra
bottle of wine, a digestif (e.g. port), or dessert
that you wouldn't normally order.
This phenomenon is particularly
prevalent in situations where
a meal is spread out over many shared courses, where
a bottle of wine is ordered & shared, when some
of the party shows up late complicating things, or when patrons
are not carrying cash and the polite thing to do is simply "split
X ways" to save the waiter the headache.