Dic: hunch (as a noun)

• I had a hunch that Susan and I would work well together.
• It seemed that the doctor’s hunch had been right.
• I had a hunch (that) you’d be back.
• to follow / back your hunches

1. N-COUNT | If you have a hunch about something, you are sure that it is correct or true, even though you do not have any proof. [INFORMAL]

2. a feeling that sth is true even though you do not have any evidence to prove it

... Cobuild, OALD

Cf.

hunch. n (= feeling) → intuition. f

• my hunch is that ... → quelque chose me dit que ...
• to have a hunch that ... → avoir comme une vague idée que ...
• to act on a hunch → suivre son intuition

... http://www.thefreedictionary.com/hunch