A very fast tour of a location, from Thomas Cook, the famous travel agent.
галопом по Европам

One who does not participate in the activity at a social event because of shyness or unpopularity.
девушка, не пользующаяся вниманием, которая на танцах стоит у стены, наблюдая за танцующими

to be with two people who are having a romantic relationship and who would prefer to be alone Yes, thank you, I'd love to go to the cinema, if you two are sure you don't mind me playing gooseberry.
Быть третьим лишним.

капельница

the inability to remember a word or put your finger on the right word

If you cannot recall the precise word for something, you have a case of lethologica, which may lead you to an obsession with trying to recall it—loganamnosis.

grimoire [griːmˈwɑː]
n — a textbook of sorcery and magic

let the buyer beware
принцип торговли, заключающийся в том, что покупатель несёт ответственность за проверку качества приобретаемого товара
лат.
да будет осмотрителен покупатель

belt and suspenders

Redundant systems, affording mutual backup in the event of one failing. -избыточная система
belt-and-suspenders person — перестраховщик
He believes in a belt and suspenders, booking flights from two different airports on different airlines for important trips.

веник, метла

a lay (noun) — песня, сказание, былина
The Lay of Igor's Raid — Слово о полку Игореве

lay (adj.) — 1. belonging to, pertaining to, or performed by the people or laity, as distinguished from the clergy: a lay sermon.
2. not belonging to, connected with, or proceeding from a profession, especially the law or medicine.
— светский; мирской; не имеющий монашеского сана; непрофессиональный

монахиня

noun
1.
a violent, turbulent, or brawling woman.
мегера; фурия
synonym: virago.

[and-ahy-ern]
noun
one of a pair of metal stands, usually of iron or brass, for holding logs in a fireplace.
железная подставка для дров в камине; подставка для дров в камине

alter ego, other side to personality, evil twin, second self

переписчик; секретарь (пишущий или печатающий под диктовку); переписчица; личный секретарь, пишущий под диктовку

1 : capable of being bought or obtained for money or other valuable consideration; especially : open to corrupt influence and especially bribery

2 : originating in, characterized by, or associated with corrupt bribery

продажный

apt to notice and make much of trivial faults or defects; faultfinding; difficult to please.
Synonyms
1. carping, crabby, cranky, cross, nitpicking, niggling, picky, testy. <a captious and cranky eater who's never met a vegetable he didn't hate>

–noun,
1.
a large merchant ship, especially one with a rich cargo.
2.
a fleet of such ships.
3.
an opulent supply.
an argosy fraught with precious wares — корабль, груженный дорогими товарами
an argosy of railway folklore — неисчерпаемый запас поездных анекдотов

portmanteau word
a word composed of parts of two or more words, such as chortle from chuckle and snort and motel from motor and hotel. The term was first used by Lewis Carroll to describe many of the unusual words in his Through the Looking-Glass , particularly in the poem "Jabberwocky."

the final resolution of the intricacies of a plot, as of a drama or novel.
развязка
The reader will spare me the unnecessary obligation of
describing the denouement .
Pushkin "An Amateur Peasant Girl"
Читатели избавят меня от излишней обязанности описывать развязку.
А. С. Пушкин "Барышня-крестьянка"