From fr.wiktionary.org:
** [en]
*** [étymologie]
[up] .
*** [nom]
[en-nom-rég] UPSURGE [en]
1. Augmentation brutale, regain .
2. * [lang=en]
*** [verbe]
[inf=upsurg] UPSURGE [en]
1. Augmenter brutalement.
2. * [lang=en]
*** [prononciation]
- [Connecticut (États-Unis)]