the tip of the iceberg

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