Welcome to Idiom 100, where we learn 100 commonly used idioms by native English speakers.

All of the explanations are in English, so it might be challenging for you,

but just try to imagine the meanings in your head and study hard and soon you'll be able to use these idioms in your conversations.

Is everyone ready? Let's begin.

Hello again!

Today's idiom is: fill in.

Fill in.

So, let's try to think about what this meaning might be and how we can imagine it.

Let's think of a glass of milk, okay, and it's full. It's a full glass of milk.

And you're going to pour out a little bit of milk.

So, now it's not full, but you want it to be full, so let's take some other milk and fill it in and now it's full again. You filled in.

Okay, so let's try to think about the meaning as we listen to 2 examples.

The first example is:

Would it be too much trouble if I asked you to fill in for me at the club meeting?

Okay, but just this once.

Okay, so he asked for his friend to fill in for him at the meeting.

Maybe he can't go to the meeting, so his friend will take his place.

Yeah, he can't go, so his friend will go and fill in for him.

Alright, so let's listen to the second example.

Should I fill her in with the information we went over?

Yes, please fill her in. She needs to understand everything before we move on.

Okay, so in this case, you have 2 people and this person has all of the information, they're full.

But she doesn't have all the information, so they need to fill her in, give her all the information, okay?

So, this idiom, fill in, has 2 meanings in what we discussed in the examples.

Alright, so the first one means to replace.

Yeah, one person will be absent, so they need someone to fill in.

And then the other situation, they don't have all of the information, so you need to fill her in or fill him in.

Okay, so it's a little confusing with the 2 definitions, but I think you can try to use them both.

Alright, so let's try to use them and I'll see you again next time.