Question

What does this expression – ‘raised his eyebrows , bit his tongue’- indicate?​

Answer 1

.People tend to use this subconscious expression to help open their eyes when they like what they see. If he raises his brows ever so slightly while you're talking, it means he's interested in whatever you're saying.

Answer 2

Answer:

To raise an eyebrow means to show scepticism, surprise as a result of being mildly scandalised.

To bit one's tongue means to forcibly prevent oneself from speaking, especially in order to avoid saying something inappropriate or likely to cause a dispute.