noun
in case of emergency; when something big happens; when it comes to the crunch
A set phrase evoking the idea of rushing to Kamakura in a crisis; used to mean 'if something major occurs' or 'in an emergency'. Often appears in the pattern いざ鎌倉というとき.
いざ鎌倉というときのために、防災グッズを用意している。
I keep emergency supplies ready for when something major happens.