Definition

A sudden decrease in quantity, participation, or performance, or the place where you abandon your kids/packages/passengers for someone else to deal with. In business metrics, it's that terrifying moment when your chart takes a nosedive and you need to explain to your boss why engagement fell off a cliff. Also conveniently describes what happens to New Year's gym memberships by February.

Example Usage

We noticed a significant drop-off in user engagement after implementing the new paywall feature.

Source: Common business and marketing terminology

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