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1. noun A sudden descent, typically in an emergency situation. The phrase is usually applied to submarines and airplanes. Engine two is out, prepare for a crash dive!
2. verb To make such a descent. My brain could barely comprehend that the our lives were in danger before the plane started to crash dive.
A thorough analysis, perhaps one that seems excessive or unwarranted for a particular topic. When you get a chance, check out the magazine's deep dive on the upcoming vote. It covers every angle. Wow, they really did a deep dive on eye shadow in that article. It was 20 pages long!
dive in with both feet
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 with both feet and do your best!
dive into (something)
1. Literally, to jump or leap into something, often a pool. I was so hot after my run that I dove into the pool as soon as I got home.
2. To start a task enthusiastically, perhaps without much forethought. Because we just dove into fixing up our house, every room is under construction at the same time.
3. To begin eating something enthusiastically. Each kid dove into his slice of cake as soon as it was set before him.
See also: dive
Literally, to jump or leap off of something, often headfirst. After debating it for several summers, Anna finally dove off the high dive at the community pool today.
duck and dive
To use one's cleverness or resourcefulness as a way to handle a situation. Longtime politicians always seem to have a great ability to duck and dive.
dive in with both feetand jump in with both feet
Fig. to become completely involved with something quickly, especially something new. I had never done anything like this before, but I just jumped in with both feet and learned it in no time.
((of) something ) to jump off something headfirst. (Of is usually retained before pronouns.) Rachel dived off of the rock into the river. She dived off the high diving board.
duck and diveuse your ingenuity to deal with or evade a situation.
1998 New Scientist You don't last for over 100 million years without some capacity to duck and dive.