upsurge
US /ˈʌp.sɝːdʒ/
UK /ˈʌp.sɝːdʒ/

1.
recrudescence, hausse, augmentation
an upward surge in the strength or quantity of something; an increase
:
•
There has been an upsurge in violent crime.
Il y a eu une recrudescence de la criminalité violente.
•
The company experienced an upsurge in sales after the new marketing campaign.
L'entreprise a connu une hausse des ventes après la nouvelle campagne de marketing.