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chain reaction

A series of events wherein the outcome of each instance specifically influences or causes the next. The phrase comes from the occurrence of such reactions in chemistry and physics. Deciding to take a course studying James Joyce in college set up a chain reaction that ultimately led me to move to Ireland. When one bookshelf fell, it caused a chain reaction that knocked over all the rest.
See also: chain, reaction

gut reaction

A reaction to a situation based on a person's instinct and feelings, rather than on a logical analysis. My initial gut reaction was that the merger would result in a drop in stock prices, but the opposite turned out to be true.
See also: gut, reaction

gut reaction to (something)

A reaction to a situation based on a person's instinct and feelings, rather than on a logical analysis. My initial gut reaction to news of the merger was that it would result in a drop in stock prices, but the opposite turned out to be true.
See also: gut, reaction, to

knee-jerk reaction

Any spontaneous, reflexive, and unthinking reaction or response. I know my knee-jerk reaction to the film's ending was mostly negative, but over time I've come to appreciate its subtlety and poignancy. Unsurprisingly, there has been a knee-jerk reaction from many parents to have the book banned from schools.
See also: reaction

my reaction when

slang A phrase used primarily in online communications alongside images of humorous facial expressions to indicate a person's typical reaction to something. She replied to my SpaceBook post with, "My reaction when people post pictures of their vacation" above a picture of a snoring child. It was a bit rude, but I couldn't help but laugh.
See also: reaction
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

knee-jerk reaction

Fig. an automatic or reflex reaction; an immediate reaction made without examining causes or facts. With one of his typical knee-jerk reactions, he said no immediately, citing some moral argument that no one understood.
See also: reaction
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

chain reaction

A series of events in which each influences or gives rise to the next event, as in If one person collects substantial damages by suing a company, you can expect a chain reaction of such lawsuits . The term originated in the physical sciences, first (1920s) chemistry and later (1940) physics; in the latter it denotes a process of nuclear fission. By the 1940s it had been transferred to more general use.
See also: chain, reaction
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.

a gut reaction

COMMON A gut reaction is a reaction that you have immediately and strongly, without thinking about something or being aware of your reasons. At first my gut reaction was to never write again. My heart's loyal to the party but my gut reaction is to vote against the bill.
1. If you describe a task or activity as gut-busting, you mean it is very hard work. It would be hard work, he predicted — back-breaking, gut-busting, unbelievably hard work.
2. You can use gut-busting to describe a very large amount of food. Walker set a record by eating a gut-busting 32 pies.
See also: gut, reaction
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

gut reaction (to something)

n. a basic and immediate response to something. Her gut reaction to the plan is basically a good one.
See also: gut, reaction, something, to

gut reaction

See also: gut, reaction
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in periodicals archive ?
Enhanced control combined with faster, safer reactions and rapid library synthesis make flow chemistry a versatile technique across the chemistry and drug discovery and development sectors.
The women of Tinder teamed up with actress and comedian Whitney Cummings in a video for a video series that explains and introduces the reactions. The reactions were chosen because they offer a wide range of emotions ( says Tinder .
We retrospectively analyzed 54 cases to investigate the use of sIgE/T-IgE in predicting honeybee venom allergy systemic reactions in northern Chinese population.
The team picked the six reactions by consulting with sociologists, according to Bloomberg.
Results: The reaction was fully completed in 7 minutes.
Want to know what a reader's reaction is as soon as he or she reads an article or watches a video?
Type A reactions are ordinary reactions which can be observed in healthy individuals and which are related with the pharmacological effect of the drug and the dose administered.
Delayed systemic reactions are defined as adverse reactions occurring between 1 hour and 12 hours of blood donation which are characterized by pallor, sweating, nausea and vomiting, hypotension, bradycardia.
In addition, ventilation and indoor gas phase chemical reactions may be linked by an indoor air quality (IAQ) model.
"Our findings clearly point to a need for parents and other caregivers to be even more vigilant in avoiding allergenic foods and treating reactions appropriately," said David Fleischer, MD, lead author and assistant professor of pediatrics at National Jewish Health.
Skin adverse drug reactions can be caused by a wide variety of agents.
Oncology nurses are in a key position to identify and treat infusion reactions. In her article in the April 2010 issue of the Clinical Journal of Oncology Nursing, Vogel discussed what oncology nurses need to know about the diagnosis, assessment, and management of both types of infusion reactions.
These social injuries include problems such as perception, understanding, participation in social activities and reaction to the clues that are essential for the social interactions [13].