#2 News English

top dog
(idiom) a dominant person in a group or in their field

part-of-speech:
countable noun (usually singular)

example sentences:
1.Yes I'm worried. Mr. Brown has been our top dog for 25 years, but he's retiring. Three of our senior executives are fighting for his job and nobody knows who'll end up as new top dog.
2.Reynolds has never concealed his ambition to be the top dog.

life jackets
something you wear to make you float if you fall into water

part-of-speech:

countable noun

example sentences:

1.He forced himself to relax, let the life jacket support him.
2.With this life jacket on I could swim round the Horn, declared Sam confidently.

eager
keen

part-of-speech:

adjective 

example sentences:
1.I am eager for news about them. He is eager to sing.
2.Tom was eager to see Mary.

balance

the ability to stay in the same position and not fall

part-of-speech:

noun;verb

example sentences:

1.The balance of the weekend went well after a slow start.

2.Getting the balance between two political forces involves a lot of arts.

guarantee
promise that something will happen

part-of-speech:

noun;verb 

example sentences:
1.No guarantee we'll survive the night, but you probably understand that.
2.I can't guarantee I'll have time for you the rest of the week.