SINCE 1828
plunge in
phrasal verb
plunged in;
plunging in;
plunges in
Definition of plunge in
1
: to push (something) into something quickly and forcefully
The nurse grabbed his arm and plunged the needle in.
2
: to start doing something with enthusiasm and energy
It was a big project, so we all just had to plunge in and get started.
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Merriam-Webster unabridged
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