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If somebody is a law unto themselves, they do things their own way and follow their own ideas about how to live instead of following what others do.
A labour of love is work that's done for pleasure or for someone's benefit rather than for money.
If you lay down the law, you tell people what they should do in a forceful and stern way.
If you lead the way, you show others where to go or what to do.
If someone leads you astray, they set a bad example and you behave badly also, or they encourage you to do the wrong thing.
If you learn the ropes, you learn how to do a job properly, or how things work and how to get things done.
If you learn your lesson, you learn something about life from making a mistake.
If you leave no stone unturned, you look everywhere in order to find something, or try everything in order to achieve something.
If you leave well enough alone, or let well enough alone, you don't try to improve or change something that's already good enough.
If you lend someone a hand, you help them.
If you let off steam, you do something to release pent-up emotion or energy.
If you let the cat out of the bag, you let someone know a secret.
If you let your hair down, you enjoy yourself by doing whatever you feel like doing and not worrying about what other people might think.
If you are the life of the party, or the life and soul of the party, you are the liveliest and most entertaining person at a social gathering.
If you can see light at the end of the tunnel, you can see some sign of the end of a difficult period.
You feel like a fish out of water if you're surrounded by people who are different to you, and it's making you feel a little uncomfortable.
If you live it up, you enjoy yourself by doing things that cost a lot of money.
If you live on your wits, or live by your wits, you don't have a regular job but you survive by cleverly manipulating people or situations.
You can say "lock, stock and barrel" to mean every single thing when you're talking about a collection of things.
If you lose face, your status falls and you aren't respected as much as you were.
If you lose your head, you become very angry about something.
You are lost for words if you're so surprised by something that you can't think of anything to say.
If you experience love at first sight, you love someone from the first moment you see them.
Something is the last straw if it's the latest in a series of annoying or upsetting events, and it's the one that finally makes you do something about the situation.
You can say something is the lion's share if it's the biggest share or portion of something.