plunge in
B2 informal intransitive
In simple words
To jump straight into something — water or an activity — without stopping to think
Literal meaning: To jump into water or a liquid
Meanings
1 B1 neutral
To jump or fall suddenly into water or another liquid
"Without hesitating, he plunged in and swam toward the struggling child."
2 B2
idiomatic
informal
To start doing something boldly and without hesitation or full preparation
"Instead of overthinking it, she just plunged in and started writing the first chapter."
Usage notes
When used figuratively, it typically implies starting something with commitment before fully preparing, which can be admirable or reckless depending on context. Often used as encouragement: 'Just plunge in and do it!'
Commonly used with
start begin task project conversation water cold
Forms
Base
plunge in
I/you/we/they
3rd person
plunges in
he/she/it
Past simple
plunged in
yesterday
Past participle
plunged in
have + pp
-ing form
plunging in
continuous
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