Idioms are phrases that have a different figurative meaning than the actual literal meaning of the words placed together.
For instance, He's in hot water doesn't literally mean that someone is in hot water. Rather, it figuratively means that they're in trouble.
Likewise, We're in the same boat doesn't actually mean that two people are in a boat together. It means that they're in the same situation.
Here are some other common idioms and their meanings:
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