the tip of the iceberg
US /ðə tɪp əv ði ˈaɪs.bɜːɡ/
UK /ðə tɪp əv ði ˈaɪs.bɜːɡ/

1.
氷山の一角
only a small, visible part of a much larger, hidden problem or situation
:
•
The recent scandal is just the tip of the iceberg; there's much more corruption to uncover.
最近のスキャンダルは氷山の一角に過ぎない。もっと多くの汚職が明らかになるだろう。
•
His current financial troubles are just the tip of the iceberg of his deeper debt problems.
彼の現在の財政問題は、彼のより深い借金問題の氷山の一角に過ぎない。