The idiom "speak up" means to speak out openly or frankly, especially during a meeting or discussion. It is used to encourage someone to share their thoughts or ideas when they are hesitant or reluctant to do so.

The idiom "glass ceiling" refers to a barrier or obstacle that prevents someone from advancing or achieving their goals, often due to discrimination or bias based on factors such as race, gender, or social status.

The idiom "green around the gills" means to be extremely anxious, nervous, or worried about something. The phrase originally refers to a boat that is rocking violently due to rough seas, which can make its occupants feel ill and anxious.

The idiom "castles in the air" means to plan or daydream about something grand or elaborate that is unlikely to happen in reality. It can also mean making promises or plans without any intention of fulfilling them.

The idiom "upper hand" refers to having the advantage or being in a more favorable position than someone else. It can also mean being able to influence or control something.