fall in

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fall in(to)

1. Literally, to drop or plummet into something. There are a lot of holes out there—be sure not to fall into any. We put up a fence around the pit so no one would accidentally fall in.
2. To collapse, crumble, or cave in. The firefighters were able to get those kids out of the house before the roof fell in.
3. To plop onto or into something. Sarah fell into the passenger seat with a dramatic sigh and proceeded to tell me all about the latest gossip at school.
4. To join a formation, as in the military. Troops, fall in!
5. To begin walking at the same pace as someone else. If you don't fall into step with us, you'll get left behind.
6. To begin to participate in something with others. How did you end up falling into a lecture with Grandpa about the Farmers' Almanac?
7. To be able to be easily grouped or categorized in a particular way. The types of arguments that my family have on Thanksgiving fall into two basic categories: food-related and sports-related.
8. To become organized in a particular way. There were a lot of missteps along the way, but all of our plans have finally fallen into place.
9. To experience a significant, usually unpleasant, change in one's mood or emotional state. I always fall into a depressive state during the winter months.
10. To experience a significant, usually unpleasant, change in state. The classroom fell into chaos as soon as the teacher stepped into the hallway.
11. To obtain something, typically unexpectedly or with little effort. When my grandfather died, I ended up falling into a lot of money.
See also: fall
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

fall in (to something)

to drop into something. The rabbit fell into the hole and was trapped. It went right up to the hole and fell in.
See also: fall

fall in (to step)

to get into the same marching pattern as everyone else as regards which foot moves forward. (Everyone should be moving the same foot forward at the same time.) I just can't seem to fall into step. I am very uncoordinated. Fall in! March with the others!
See also: fall

fall in

to line up in a row, standing shoulder to shoulder. The Boy Scouts were told to fall in behind the leader. The soldiers fell in quickly.
See also: fall
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

fall in

1. Take one's place in formation or in the ranks, as in The sergeant ordered the troops to fall in. A related expression is fall into, as in They all fell into their places. [Early 1600s] Also see fall into.
2. Sink inward, cave in, as in The snow was so heavy that we feared the roof would fall in. [Early 1700s] Also see under drop in; the subsequent idioms beginning with fall in; fall into.
See also: fall
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.

fall in

1. To take one's place in military formation, especially a line. Used of soldiers: The troops fell in immediately upon the command of their sergeant.
2. To sink inward; cave in: Under the weight of the snow, the roof of the old barn finally fell in.
3. fall in with To become associated with some group of people: They fell in with the wrong crowd and were eventually arrested for armed robbery.
See also: fall
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.
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The rainy weather has led to one ray of sunshine - a fall in burglaries.
Burglaries in parts of Sussex and Cleveland have dropped by as much as 60 per cent, while the fall in Nottinghamshire, Cambridgeshire, Devon and Cornwall is between 20 and 25 per cent.
This has led to the fall in the export-import ratio by 2.4 percentage points to 69.5% against 71.9% in the same period last year.
fall in oil exports -71%, (72.8 MTD against 249.8 MTD in 2011) and the decline of exports of phosphoric acid by -93% (3 MTD against 43.8 MTD) and the absence of raw phosphate exports which, in January 2011, had stood at 7.5 MTD.
Burglary has been a problem for police in Cardiff over the last year, but the city's burglary supremo Bob Tooby (pictured) has pledged that the rise in break-ins recorded in last year's annual statistics has already started to fall in the first months of 2008-09.
Supermarkets are not thought to be keen to promote the Atkins diet because, while it creates a boom ins ales of egg, beef and fatty foods, it has also led to a fall ins ales of bread, potatoes and high carbohydrate ingredients.