taru-adjective, adverb taking the 'to' particle
wide and deep; voluminous
Literary or poetic description of a body of water that is both broad and deep, or figuratively of something vast and abundant. Often used in classical or formal contexts.
Before the vast, deep ocean, he was at a loss for words.
The lake was wide and deep, so much so that the bottom could not be seen.
Variant without the iteration mark; less common but still encountered.
The kanji 汪 means 'deep and vast (of water)'. The reduplicated form 汪々 is a literary Chinese-derived expression used in classical Japanese to describe expansive, deep waters. The exact historical derivation is uncertain; it is a Sino-Japanese word.