Examples:

• Not to answer back after a correction from the teacher.
• I can say anything and he doesn't answer back.
• We'll send our answer back in two days.
• Don't answer back, that's what she wants.
• Waiting on our answer back at the hotel.
• I talk and talk, but they never answer back.
• So, before I answer back in proceedings, I just need to know...
• No, there's no need to answer back.
• Don't answer back, that's what she wants.
• I didn't know the answer back then.