به شدت تایید کردن !Absolutely
?Mother: Do you want another piece of cake
!Child: Absolutely
به شدت رد کردن !Absolutely not
?Bob: Can I please have the car again tonight
!Father: Absolutely not
"just in case" means "only because there is a very small chance" (that something may happen). It's quite common in a clause that begins with "but". (The "but" is by no means required, however.)