In the sentence “The news hit him like a ton of bricks,” what does the phrase “like a ton of bricks” mean?

What does the word “cool” mean in the following sentence: “She has a cool new gadget”?

In a biology text, the term “osmosis” is used to describe how water moves through a cell. What type of meaning is this?

When someone says, “Time flies when you’re having fun,” what does “Time flies” mean?

If a character in a story is described as having a “heart of gold,” what does this mean?

In a medical text, the term “benign” is used to describe a tumor. What does “benign” mean in this context?

What does the phrase “burning the midnight oil” mean?

If someone is described as “walking on air,” how are they feeling?

In an engineering text, the term “torsion” refers to:

 In literature, if darkness is often used to represent “mystery” or “the unknown,” this is an example of what type of meaning?