dive in

dive in

To begin or undertake something quickly, enthusiastically, and without trepidation. I know you're nervous about starting school, but you just need to dive in and do your best!
See also: dive
Farlex Dictionary of Idioms.

dive in

v.
1. To plunge one's body into something: The swimmer stood at the edge of the pool and dived in. The bird flew up suddenly before diving in the water.
2. To start enthusiastically: The teacher laid out the chemistry equipment, and the students dived in.
3. To start eating eagerly: I'm getting hungry, I can't wait to dive in. Here's the pizza; dive in!
See also: dive
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • dive in with both feet
  • jump in feet first
  • jump in with both feet
  • jump in with both feet, to
  • have (one's) heart in (something)
  • have your heart in
  • Go for it!
  • hate (someone or something) like sin
  • hate like sin
  • great guns