hunch noun
VERB + HUNCH have I had a hunch that she was not telling the truth. | act on, follow, play Acting on a hunch, I waited outside her house to see if she went out. I decided to follow my hunch and come and see you. | back, confirm They now have a database of information to back their hunches about customers' preferences.
PREP. on a ~ I phoned on a hunch to ask if they had any work for me.
You can also check other dicts: hunch (English, 中文解释 ), wordnet sense, Collins Definition