ERASE
Unsetting a variable i.e. deleting it.
Example
DIM test$=("kytschBASIC","is","awesome!")
FOR val$ IN test$
PRINT val$
PRINT " "
NEXT
LINE BREAK
ERASE test$[0]
FOR val$ IN test$
PRINT val$
PRINT " "
NEXT
Output
kytschBASIC is awesome!
is awesome!
is awesome!