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A can of worms
Meaning: A situation that can create serious or complicated problems
Example: You are opening a can of worms if you start offering discounts to some of the clients.

Add fuel to the fire
Meaning: Making an argument or conflict even worse
Example: In the argument with her boss, Patricia’s comments only add fuel to the fire.

At the coalface
Meaning: Doing the work of a job or dealing with the real problems rather than simply sitting there talking about the issue
Example: Mary is a good boss as she works at the coalface together with her team-mates.

At the drop of a hat
Meaning: If you would do something at the drop of a hat, you would do it immediately, without hesitation.
Example: David always finishes the tasks assigned by his manager at the drop of a hat.

At the top of the ladder
Meaning: In the highest position in an organization
Example: Having worked for many years in the hotel industry, he is now at the top of the ladder .