tighten your belt
Meaning: If you tighten your belt, you try to spend less money.
face to face
Meaning: If people meet face to face, they meet in person in the real world.
jump on the bandwagon
Meaning: If someone jumps on the bandwagon, they join a movement or follow a fashion that has recently become popular.
go over your head
Meaning: If someone goes over your head, they go to someone with more authority than you in order to get something that you would normally grant, possibly because they think you won't give it to them.
upset the applecart
Meaning: If you upset the applecart, you do something that causes trouble or upsets someone's plans.
just the ticket
Meaning: You can say something is just the ticket if it's the perfect thing or if it's exactly what's needed.
another string to your bow
Meaning: If you have another string to your bow, you have another way of making a living.
the tip of the iceberg
Meaning: You can say something is the tip of the iceberg when it's just a small part of something much bigger.
cover your tracks
Meaning: If you cover your tracks, you make sure no-one can find evidence of what you've done.
have a heart-to-heart
Meaning: If you have a heart-to-heart with someone, you have an honest talk and share your feelings with each other.
vote with your feet
Meaning: If you vote with your feet, you show your opinion of something by acting in a certain way, such as by buying something if you like it, or by not buying it if you don't like it.
vim and vigor
Meaning: If you have vim and vigor, you have lots of energy and enthusiasm for life.
You are what you eat.
Meaning: You can say "you are what you eat" when you want to point out the connection between food and health.
make a killing
Meaning: If you make a killing, you make a lot of money from a sale or a deal of some sort.
up to your neck | up to your eyeballs
Meaning: If you're up to your neck in something, or up to your eyeballs in something, you've got too much of it and it's become a problem.
dirt cheap
Meaning: You can say something is dirt cheap if it costs very little money.
rub it in
Meaning: If you rub it in, you keep talking about something that embarrasses or upsets someone.
a fair-weather friend
Meaning: A fair-weather friend is a person who will only be your friend when things are going well for you.
esprit de corps
Meaning: A feeling of pride and comradeship shared by members of a group such as a military unit or a sports team
make hay while the sun shines
Meaning: If you make hay while the sun shines, you make good use of the chance to do something while it lasts.
a night owl
Meaning: You're a night owl if you like to stay up and do things late at night.
feather your own nest
Meaning: If you feather your own nest, you use your position or your job illegally for personal gain.
lose face
Meaning: If you lose face, your status falls and you aren't respected as much as you were.
the upper crust
Meaning: If you are one of the upper crust, you are a member of society's highest class.
vanish into thin air
Meaning: If something vanishes into thin air, it disappears completely.