Why was "tantrum" trending last week?
An abrupt and severe reduction in the number of individuals during the history of a species, resulting in the loss of diversity from the gene pool. The generations following the bottleneck are more genetically homogenous than would otherwise be expected. Bottlenecks often occur in consequence of a catastrophic event.
The point at which an industry or economic system has to slow its growth because one or more of its components cannot keep up with demand.