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1. Goody two shoes

This idiom can be used for people who always do good things according to the existing rules. Example:

1. No child wants to be a goody two-shoes, and, this is one way for them to demonstrate that they're not.
This means that no child wants to do a good thing according to the rules, and this is one way of doing it.

2. She's just such a goody two shoes. She's always trying so hard to be perfect.
Meaning, he obeyed the rules too much. He always tries to be perfect.

2. If the shoe fits, wear it

This idiom has the meaning, if, there is criticism that is true. Examples of use:

1. A: "There are too many lazy people in this house."
B: "Including me, I suppose?"
A: "If the cap fits, wear it."
Meaning, A: "There are too many lazy people in this house."
B: "Including me, I guess?"
A: "If you feel that way, yes, you are."

2. I know you don't like being called unreliable, but if the shoes fits, wear it.
That means I know you don't like to be called unreliable, but, the truth is, you are.

3. In your shoes

Furthermore, this idiom is meaningful, if it is in someone else's position. Example:

1. It's easy to mock someone else until you've lived in their shoes for a while.
Meaning, it's very easy to mock other people until you've been in their shoes for a while.

2. As hard as it is to live with a disability, remember that you're not alone — a lot of other people are in your shoes, too.
This means that life is hard for people with disabilities, remember that you are not alone — many other people are also in your position.

4. On shoestring budget

This idiom can be used to express something that doesn't cost a lot of money. Example:

1. Staying in hotels is a good option if you're traveling on a shoestring budget.
This means that staying in a hotel is the best option for a low-cost trip.

2. We traveled through France last year on a shoestring budget.
This means, last year we were traveling around France on a cheap budget.

3. We plan to spend a month in Bali on shoestring budget.
This means that we are planning an inexpensive trip to Bali this month.

5. Big shoes to fill

This idiom is meaningful, trying to work hard to match the standard of living of others. Examples of use:

1. Samantha's older sister went to Harvard, and now has a successful career. Samantha has big shoes to fill!
This means that Samantha's oldest brother studied at Harvard, and is now successful. Samantha, have to work hard to be with him.

2. Our new teacher has big shoes to fill, because our old teacher was so great!
This means that our new teacher must be able to match the greatness of our old teacher.

6. Waiting for the other shoe to drop

This idiom can be expressed when a bad thing that has been predicted will happen, and it cannot be avoided anymore, so, inevitably, we accept it. Examples of use:

1. Mom said that Dad would punish us when he got home from work, so now we're just waiting for the other shoe to drop.
Meaning, mom said that Dad will punish us when he comes home from work, so now we can only surrender.

2. Now she has a good enough job to leave her husband, we're just waiting for the other shoe to drop.
This means that now she has a job that is good enough to leave her husband, and, we can only give up.

7.Put (oneself) in (someones) shoes

Finally, this idiom is expressed when in a situation to understand the point of view or what other people feel. Examples of use:

1. Before being quick to judge someone for their actions, you should always try to put yourself in their shoes. Everyone is human, after all.
This means that before you can quickly judge what other people are doing, you should always try to feel where they are. After all, they are also human.

2. Put yourself in my shoes and then tell me what you would have done.
It means, feel first to be them, then then tell me what you are going to do.