Glossary entry (derived from question below)
English term or phrase:
fight-or-flight mode.
Portuguese translation:
modo pegar ou largar / enfrentar ou recuar / reagir ou fugir
English term
Brazil
Finance/Crypto/Legal • 15yr exp.
Native in: Portuguese (Variant: Brazilian) 
Works in: English to Portuguese, Spanish to Portuguese, French to Portuguese
fight-or-flight mode.
When we feel threatened, our body goes into fight-or-flight mode.
It shuts down the reasoning section of our brain, making it harder to think rationally.
Dec 3, 2023 12:39: expressisverbis Created KOG entry
Proposed translations
Portugal
Translator and Terminologist
Native in: Portuguese
Works in: English to Portuguese, French to Portuguese, Spanish to Portuguese
modo pegar ou largar / enfrentar ou recuar / reagir ou fugir
Ou ainda: Modo lutar ou escapar
used to describe the reaction that people have to a dangerous situation, that makes them either stay and deal with it, or run away:
https://dictionary.cambridge.org/pt/dicionario/ingles/fight-...
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Note added at 15 mins (2020-08-12 15:44:10 GMT)
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Aqui mais uma, talvez para pt-br:
Bater ou correr
https://pt.bab.la/dicionario/ingles-portugues/fight-or-fligh...
fight-or-flight n as adj (denoting instinctive response) enfrentar ou fugir
https://www.wordreference.com/enpt/fight-or-flight
"...fight-or-flight responses." - reações de lutar ou fugir (luta ou fuga), ou, reações de bater ou correr.
https://www.englishexperts.com.br/forum/traducao-de-fight-or...
Brazil
Video game localization and marketing
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
Luta ou fuga
Peru
Engineering, wastewater, environment
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English, and 3 more.
reação luta ou fuga
Brazil
Translation| Localization| Transcreation
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, French to Portuguese, and 1 more.
modo de lutar/encarar ou surtar
Brazil
Human sciences specialist
Native in: Portuguese (Variant: Brazilian)
Works in: French to Portuguese, Portuguese to French, English to Portuguese, and 2 more.
Luta ou surta
Brazil
12-years' experience | MKT, Legal, IT
Native in: Portuguese
Works in: English to Portuguese, French to Portuguese, Spanish to Portuguese
modo de fuga ou ataque
https://www.terra.com.br/vida-e-estilo/saude/saiba-quais-sao...
"Segundo ele, as reações podem ser de fuga ou ataque e são essenciais para o indivíduo se salvar, por exemplo, de um prédio em chamas"
http://pepsic.bvsalud.org/scielo.php?script=sci_arttext&pid=...
"Comportamentos de esquiva, fuga ou ataque, que são funcionais para se livrar de muitas situações aversivas públicas, não são eficazes em reduzir sentimentos dolorosos. "
https://blog.paulatostes.com.br/relacao-do-estresse-com-fisi...
"Essas reações foram denominadas de respostas de ataque e fuga (fight-or-fight), porque preparam o organismo para fazer face à ameaça ou para desencadear a fuga."
Brazil
PT/EN Translator - ABRATES Certified
Native in: English (Variants: UK, British) 
, Portuguese (Variant: Brazilian)
Works in: Portuguese to English, English to Portuguese
ou vai ou racha
Brazil
EN PT(BR)EN PT.
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, German to Portuguese, and 8 more.
Discussion
https://observador.pt/2016/11/17/guia-para-lidar-com-a-ansie...
... o conceito em psicologia (reação de luta ou fuga), mas se quer algo que rime...