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Phrase(s): dive in(to something)
1. Lit. to plunge into something; to jump into something headfirst. • Don’t dive into that water! It’s too shallow. • David walked to the edge of the pool and dived in. 2. Fig. to start immediately on some business or activity with energy. • I can’t wait to dive into the next project. • Clara dives into her work eagerly every morning.
McGrawhill's American Idioms And Phrasal Verbs