The word "gladstone" can refer to two main things, so let's break it down:
Gladstone (noun): A large traveling bag made of stiff leather. It's typically used for carrying clothes and personal items when traveling.
Gladstone (proper noun): This term also refers to William Ewart Gladstone, a famous British statesman who served as Prime Minister of the United Kingdom four times during the late 19th century.
For the traveling bag meaning: - Suitcase - Luggage - Travel bag
There are no specific idioms or phrasal verbs that use "gladstone" directly. However, you might hear phrases related to travel, like "pack up" or "set off," which can be connected to the usage of a gladstone bag when someone is getting ready to travel.