To Be Transparent
To Be See-Through
intransitive verb, ichidan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means transparent and the verb vocab version is to be transparent or to be see-through.
透ける is usually for things that are partially transparent or see-through because they're thin or sheer, like stockings and lace curtains. Sometimes people even joke that your true thoughts are 透けてる (showing through).
To remember the reading, just think about something that is supposed to not be transparent, but is transparent after you give it to someone for a while. You're so upset that your dog, cat, plant, car, etc. is transparent that you sue the guy who was supposed to not make it transparent.
光っている電球の上に銀色のスクラッチカードを当てると、その銀色の部分の下に何が書かれてるかが透けて見えちゃうことがあるんだよ。
If you put a silver scratch card over a bright lightbulb, sometimes you can see through the silver part at what's written underneath.