1. what
2. you-know-what; that thing
3. whatsit; whachamacallit; what's-his-name; what's-her-name
4. (not) at all; (not) in the slightest
with neg. sentence
5. what?; huh?
indicates surprise
6. hey!
indicates anger or irritability
7. oh, no (it's fine); why (it's nothing); oh (certainly not)
used to dismiss someone's worries, concerns, etc.