greatest fear
noun phraseUK /ˈɡreɪ.tɪst fɪə/
US /ˈɡreɪ.tɪst fɪr/
The thing you are most scared of.
Her greatest fear is speaking in front of the whole class.
OTHER MEANINGS
2. The scariest thing you can imagine happening.
His greatest fear is losing his family.
3. A worry that feels bigger than all your other worries.
For the little boy, his greatest fear was the dark.
4. The one danger you want most to avoid.
The pilot's greatest fear is a storm at night.