lock-in

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.

The youth group will have their annual lock-in this weekend.

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.

He was a lunatic drunk and started sing songs that lasted into the early hours of the morning and resulted in many weekend lock-ins in the village pub.

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.

vendor lock-in

The situation where an investor cannot trade without incurring an undesirable penalty such as taxation.