|bee’s knees||To say that someone/something is the bee’s knees means that you think they are exceptionally good.|
If you say “Chloe thinks she’s the bee’s knees” you mean that
Chloe has a high opinion of herself.
|on its knees||When something such as a country or organization is on its knees, or brought to its knees, it is in a very weak situation.|
The civil war brought the country to its knees.
|knee-high to a grasshopper||This term refers to a very young or small child.|
Look how tall you are! Last time I saw you, you were knee-high to a grasshopper!
|not have a leg to stand on||To say that someone does not have a leg to stand on means that they cannot prove what they say.|
Three people testified against him. He didn’t have a leg to stand on.
|on one’s last legs||If you are on your last legs, you are in a very weak condition or about to die.|
I was so sick that I felt as though I was on my last legs!
|pull (someone’s) leg||If you pull somebody’s leg, you tease them by telling them something that is not true.|
Of course I’m not going to buy a sports car. I was just pulling your leg!
|put your pants on one leg at a time||To say that someone puts their pants on one leg at a time means that the person is a human being no different from enyone else.|
Don’t be scared to speak to him. He puts his pants on one leg at a time just like the rest of us!
|sea legs||A person who has sea legs is used to walking on a moving ship, or has the ability to adjust to a new situation.|
It takes a while in a new job to find your sea legs.
|Achilles heel||This expression refers to a vulnerable area or a weak spot, in an otherwise strong situation, that could cause one’s downfall or failure.|
He’s extremely intelligent, but his inability to speak in public is his Achilles heel.
|bring someone to heel||If you force someone to behave in a disciplined manner, you bring them to heel.|
The boy had always behaved badly, but the new headmaster managed to bring him to heel.
|cool one’s heels||If you are left to cool your heels, someone keeps you waiting.|
After rushing to be on time for my appointment, I was left to cool my heels in the waiting room for an hour.
|dig in your heels||If you dig in your heels, you refuse to do something, especially if someone is trying to convince you to do so.|
My grandfather dug in his heels and refused to move to an apartment.
|hairy at the heel||A person who is hairy at the heel is thought to be untrustworthy or even dangerous.|
Rumour has it that the owner of the club is a bit hairy at the heel.
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|dip one’s toes in the water||If you dip your toes in the water, or get your feet wet, you start to do something new or unfamiliar, or explore new territory for the first time.|
It will be a new experience for me, but I can’t wait to dip my toes in the water!
|keep someone on their toes||If you keep someone on their toes, you make them stay alert and ready for action at any time.|
The manager never announces his visits beforehand. That’s his way of keeping the personnel on their toes.
|step/tread on someone’s toes||If you annoy or irritate someone by intervening in a situation that is their responsibility, you step on their toes.|
I could offer some advice but I’m afraid of stepping on someone’s toes.