gut feeling
An intuition or instinct, as opposed to an opinion based on a logical analysis. Jennifer's mother had a gut feeling that something was wrong when her daughter wasn't home by 10 o'clock.
gut feeling
and gut reaction; gut responsea personal, intuitive feeling or response. I have a gut feeling that something bad is going to happen. My gut reaction is that we should hire Susan for the job.
a gut feeling
COMMON If you have a gut feeling about something, you are sure you are right about it even though you cannot give reasons. I had a gut feeling that he was lying too.