To be transparent or to show through (e.g., clothing, paper, glass); to be visible through something.
白いシャツが濡れて下着の色が透けてしまった。
The white shirt got wet and the color of the underwear showed through.
不安な気持ちが顔に透けて見える。
An anxious feeling shows on his face.
紙が薄くて向こうの文字が透けて見える。
The paper is thin and the writing on the other side shows through.