- nightcap = a drink, sometimes an alcoholic drink, that someone has just before going to bed
- стаканчик на ночь
[Emily in Paris, 2022]

- flabbergasted = feeling shocked, usually because of something you were not expecting
- ошарашенный/изумлённый/поражённый
[The Wonderful Story of Henry Sugar, 2023]

- DOA = dead on arrival (= certain to fail)
- обречённый на провал/нежизнеспособный
[American Fiction, 2023]

- to dog-ear = to fold down the corner of a page
- загибать уголок страницы
[The French Dispatch, 2020]

https://news.1rj.ru/str/for_instance_eng/371

- to plunder = to steal, especially during a war
- грабить/расхищать/красть etc.
[Anatomie d'une chute, 2023]

- astute = able to understand a situation quickly and see how to take advantage of it
- проницательный/сообразительный
[Sex Education, 2021]

- to mooch = to walk or do things slowly and without much purpose
- слоняться/околачиваться
[The Wonderful Story of Henry Sugar, 2023]

- old chestnut = a subject, idea, or joke that has been discussed or repeated so often that it is not funny any more
- избитая шутка/старый приёмчик/анекдот «с бородой» (букв.: старый каштан)
[Sometimes I Think About Dying, 2023]

- millstone = a heavy burden
- бремя/камень (на шее)
[Ripley, 2024]

- fluke = something that happens, usually something good, that is the result of chance instead of skill or planning
- счастливая случайность/чистое везение/счастливое стечение обстоятельств
[Emily in Paris, 2022]

https://news.1rj.ru/str/for_instance_eng/554

- chop-socky = a colloquial term for martial arts films and kung fu films made primarily by Hong Kong action cinema between the late 1960s and early 1980s
- кунг-фу боевики
[Sex and the City, 2001]

🥋 свой вариант перевода можно оставить в комментах

- sea legs = a person's ability to keep their balance while walking on a moving ship and to not be ill
- способность держаться на ногах во время качки
[SpongeBob SquarePants, 1999]

- opaque = difficult to understand
- непрозрачный/непроницаемый/неясный/непонятный
[Staged, 2021]

- pigsty= a dirty or messy place
- свинарник
[You, 2018]

- dodgy = likely to be dishonest or illegal
- сомнительный/хитрый/изворотливый
[Sex Education, 2021]

🎂 🎂 🎂
- a pinch to grow an inch - on your birthday, guests pinch you to help you grow taller
- расти большой, не будь лапшой
[Are You There God? It's Me, Margaret., 2023]

- stick = a car with a stick shift
- механика (машина с механической коробкой передач)
[Emily in Paris, 2021]

https://news.1rj.ru/str/for_instance_eng/318

- hooey = something that is not true or does not make sense, although some people may believe it
- чушь/ерунда/пустые слова/брехня etc.
[13 Reasons Why, 2018]

- to run errands = to go out to buy or do something
- бегать по делам
[Ripley, 2024]