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1. Literally, to leap into something, such as water. The water feels great! Come on and jump in! When I was a kid, I loved the fall, when we'd jump in big piles of leaves.
2. To begin or undertake something quickly, enthusiastically, and without trepidation. I know you're nervous about starting school, but you just need to jump in and do your best! Instead of sitting around and talking about it, let's just jump in and start putting this thing together.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
((to) something) to leap into something, such as water, a bed, a problem, etc. She was so cold she just jumped into bed and pulled up the covers. I jumped in and had a refreshing swim.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Also jump in with both feet or into the ring . Enter into something enthusiastically; also, act precipitately. For example, When Don found out what his job was to be, he was ready to jump in immediately, or As soon as they asked me to join, I jumped in with both feet, or When buying securities, Anne's apt to jump into the ring, no matter what the risks. The first two usages allude to jumping into water; the third alludes to entering the fray of the boxing ring.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. To leap or bound in or into something: The lake is nice and warm; jump in! Don't jump in the water here; there are rocks below.
2. To enter something quickly, especially a vehicle: She jumped in, I hit the gas, and we took off. Jump in the car and let's go.
3. To join some activity that is already in progress: I like your project; do you think I could jump in? I jumped in on their card game in the third round.
4. To interrupt someone or join a conversation suddenly, especially with an uninvited opinion: I wanted to finish the meeting quickly, but people kept jumping in. My neighbor jumped in with a strong objection at our town meeting.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.