バレバレ(of a lie, etc.) obvious, transparent

子供(こども)の嘘(うそ)はいつもバレバレだ。

Children's lies are always obvious. {(of a lie, etc.) obvious, transparent}

先生(せんせい)には生徒(せいと)の悪戯(あくぎ)はバレバレだった。

The teacher saw right through the students' pranks; they were completely obvious. {(of a lie, etc.) obvious, transparent}

警察(けいさつ)には彼女(かのじょ)のしていたことがバレバレでした。

It was obvious to the police what she had been doing. {(of a lie, etc.) obvious, transparent}

先生(せんせい)：「お前(まえ)がさっき他(た)の生徒(せいと)を殴(なぐ)ったのはバレバレだ！」

Teacher: "It's obvious that you hit another student earlier!" {(of a lie, etc.) obvious, transparent}

彼(かれ)が彼女(かのじょ)をいじめているのはバレバレなので、彼(かれ)を注意(ちゅうい)するつもりだ。

Since it's obvious that he is bullying her, I intend to warn him. {(of a lie, etc.) obvious, transparent}