Definitions from Wiktionary ( )

▸ noun:  (US) A sleepover party, usually held in a public place such as a church or school, in which the participants are not allowed to leave until the next morning.
▸ noun:  (UK, Ireland) An illegal but widely-tolerated invitation-only gathering in a British pub, after the end of licensing hours, to allow regular customers the opportunity to enjoy further drinking time.
▸ noun:  (law) A situation in which members of an industry have agreed to adopt a certain standard and have retooled their production to meet this standard, thus making it very costly to change to a different standard.
▸ noun:  (finance) The situation where an investor cannot trade without incurring an undesirable penalty such as taxation.

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