plunge in
中上級 (B2) informal
To jump straight into something — water or an activity — without stopping to think
"Without hesitating, he plunged in and swam toward the struggling child."
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The Nightmare Geography Glitch Hiding in New Hampshire
RealLifeLore · 11:13
temperatures can unexpectedly plunge in
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Jimmy Kimmel Live · 1:18
There was a cold plunge in their
The Best Vitality & Health Protocols | Dr. Rhonda Patrick
Andrew Huberman · 59:51
I don't cold plunge in the 6 to8