What does the word "rat" mean in the sentence below?

My brother was doing something wrong, so I had to rat him out to my mom.

What does the word "ruler" mean in the sentence below?

I had to measure something. I got out my ruler to do so.

What does the word "mug" mean in the sentence below?

My mom made me a glass of hot chocolate in a mug.

What does the word "cake" mean in the sentence below?

I thought the math problem was not very hard. I told my dad it was a piece of cake.

What does the word "bat" mean in the sentence below?

I was playing in a baseball game. My coach told me I was next up to bat.

What does the word "chest" mean in the sentence below?

I went to the doctor. He wanted to check my heart so he listened to my chest.

What does the word "blue" mean in the sentence below?

My pet fish just died, so I am feeling a little blue.

What does the word "log" mean in the sentence below?

My dad cut a tree into pieces and then picked up a log.

What does the word "duck" mean in the sentence below.

My dad is so tall, he has to duck when he walks through the door so he doesn't hit his head.

What does the word "ring" mean in the sentence below?

My cousin asked his girlfriend to marry him. He gave her a ring.