If you put a silver scratch card over a bright lightbulb, sometimes you can see through the silver part at what’s written underneath.
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 (since usually people can't "to transparent" something).
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.