C2 IDIOMS 15.1

the established set of attitudes held by someone.

a thing that has disadvantages as well as advantages.

a payment given to someone who is made redundant or retires early.

remain inconspicuous in difficult or dangerous times

Something has not yet been decided or is still unclear

the past achievements or performance of a person, organization, or product.

a huge, often sudden, increase or advance in something.

To learn your trade and gain experience professionally

used to refer to a situation of fierce competition in which people are willing to harm each other in order to succeed.

to buy or take (something or someone) quickly or eagerly

To become more successful or important

an easy remedy or solution, especially a temporary one which fails to address underlying problems