biggest concern
noun phraseUK /ˈbɪɡɪst kənˈsɜːn/
US /ˈbɪɡɪst kənˈsɝːn/
The thing that worries you the most.
My biggest concern is that we will miss the bus.
OTHER MEANINGS
2. The most important thing you care about.
Her biggest concern is keeping her family safe.
3. The most serious problem in a situation.
The biggest concern for the team is the lack of time.
4. The thing that needs the most attention.
For the doctor, the biggest concern was the patient's fever.