to explore or investigate deeply
深く調査する、または探る (fukaku chousa suru, matawa saguru)
"The scientist decided to delve in to the mysteries of the deep sea."
"科学者は深海の謎に掘り下げることを決定しました。" (Kagakusha wa shinkai no nazo ni **delv in** suru koto o kettei shimashita.)
to gradually disappear from view or sound
to take or get something from a source
to recover or succeed after a difficult situation
to become less strict or critical toward someone
to remove waste or mess left behind by people or animals
to prove to be something in the end
