to find the real cause of a problem
問題の本当の原因を見つけること (monogoto no hontou no gen'in o tsukitomeru)
"The manager promised to get to the bottom of the issue."
"マネージャーはその問題の本当の原因を突き止めると約束しました。" (Manejā wa mondai no hontou no gen'in o tsukitometai to omotte iru.)
to watch someone carefully because you don’t trust them comp...
a controversial issue that no one wants to deal with
A strong desire to learn new things.
To be very full or crowded.
the time for something or someone has ended
to make a sincere promise, often used by children