My mother has that problem. it comes from years of anticipating and prediciting what people are going to say and it is a habit but non-threatening.
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Moving the lips while others are talking could be a sign of subvocalization, where a person silently repeats the words they are hearing in order to better understand or process the information. It could also be due to a habit or a way to stay engaged in the conversation.
Licking their lips while you talk to them could indicate nervousness or anxiety. It might be a subconscious behavior to soothe themselves or a sign of discomfort in the conversation. Pay attention to other nonverbal cues to understand better how they are feeling.
It could mean that he is attracted to you and is imagining kissing you, or it could simply be a habit he has while talking. Pay attention to other body language cues to better understand his intentions.
Rubbing the lips while talking can be a sign of nervousness, uncertainty, or discomfort. It could indicate that the person is feeling anxious or trying to soothe themselves during the conversation.
When someone looks at your mouth as you speak, it could show that they are focusing on your words and trying to understand you better, or it could indicate that they are trying to read your lips if they have difficulty hearing or understanding what you are saying.
To sign "kiss" in American Sign Language (ASL), bring your dominant hand up to your lips, puckering your lips slightly as if about to kiss someone, then move your hand forward slightly.