Wiktionary
vb. (context idiomatic English) To start a new endeavor enthusiastically and wholeheartedly.
Wikipedia
Dive In is Darius Danesh's debut album, released toward the end of 2002. It was a huge success and went platinum in the UK, charting at number 6 in the UK albums chart during the competitive pre-Christmas sales. He wrote all 12 songs on the album, collaborating with a number of other producers such as The Misfits and The Matrix. Steve Lillywhite was executive producer and Darius himself produced the track "Better Than That".
"Dive In" is a song by American R&B recording artist Trey Songz from his fifth studio album Chapter V. It was released on August 14, 2012 by Atlantic Records. The song peaked at number 77 on the Billboard Hot 100 and at number 5 on the Hot R&B/Hip-Hop Songs chart.
Usage examples of "dive in".
The same would be true of the child's companion if he should dive in and attempt a rescue.
As it was, about twenty yards on each side of the bridge were cut each year, and you could dive in from the bridge itself.
Monsieur Pouchette rose from his disculpations with a gasp of relief like a swimmer from a dive in deep waters.
Eight years ago he was beaten, raped, and found with a silver wire around his neck outside a dive in Seoul.