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To be thankful or grateful for one's good luck usually while avoiding a bad situation
You should count your lucky stars as you managed to avoid that violent car accident.
To punish someone or something harshly
He's a really strict teacher, so he'll definitely lower the boom on you if you don't do your homework.
To be cautious; to plan ahead instead of taking a risk
I like to err on the side of caution and always keep some money in my savings account.
If someone live under the cat's foot, they are under the dominion of another person, typically their wife.
The man has been living under the cat’s foot for years, and now he just wants a divorce from his wife.
Used to ask someone whether they hear or understand you
Go straight ahead, Tom! Do you read me?