Related Clues:
- Second helping, to a dieter
- Underwater craft, briefly
- 'What were you thinking?!'
- Deputy on bench in test
- Taboo, to a child
- Social impropriety
- Something you might get your hand slapped for doing
- Bad thing
- "Mustn't do" thing
- U-boat, e.g
- Talking with one's mouth full, e.g
- Texting while driving, e.g
- Footlong, e.g
- Cousteau craft
- 4, something to be avoided