What are some idioms related to challenges and obstacles?

There are several idioms related to challenges and obstacles. Here are a few examples:

1. "Hit a brick wall" - This idiom means to encounter a difficulty or obstacle that prevents progress or success.
Example: "I've been trying to solve this math problem for hours, but I've hit a brick wall."

2. "Uphill battle" - This idiom refers to a difficult or challenging task that requires a lot of effort to accomplish.
Example: "Starting a new business is always an uphill battle, but with determination, it can be successful."

3. "Bite off more than you can chew" - This idiom means to take on more responsibilities or tasks than one can handle.
Example: "I think I bit off more than I can chew by agreeing to organize the entire event by myself."

4. "Jump through hoops" - This idiom means to go through a series of difficult or complicated tasks or requirements in order to achieve something.
Example: "In order to get a visa, I had to jump through hoops and provide numerous documents."

5. "Break the ice" - This idiom means to overcome initial tension or awkwardness in a social situation.
Example: "He told a joke to break the ice and make everyone feel more comfortable."

6. "In the same boat" - This idiom means to be in the same difficult or challenging situation as someone else.
Example: "We're all struggling with this project deadline, so we're all in the same boat."

These are just a few examples of idioms related to challenges and obstacles. There are many more idioms that can be used in different contexts to describe difficulties and hurdles.