Bark up the wrong tree - selecting the wrong course of way, looking in the wrong place
Put the cart before the horse - doing things in the wrong order
A flash in the pan - Something which looks like a huge success, but fails to work out.
In a pickle - In an embarrassed or discomforting situation, in a problematic situation.
Bite off more than you can chew - Take on more than one can manage.
A stitch in time saves nine - Doing something in advance, saves having to do much harder work later.
All bark and no bite - A person who talks far more insistently than they act.
Finding your feet - To gain self-confidence in what you are doing.
A blessing in disguise- a good thing that seemed bad at first.
Bet on the wrong horse - Misread the future, make plans that go awry.
Beat around the bush- Avoid saying what you mean, usually because it is uncomfortable.
Better late than never- Better to arrive late than not to come at all.
Bite the bullet- To get something over with because it is inevitable.
Call it a day- Stop working on something
Rolling in the aisles - Laughing loudly.
To throw in the towel - To give up and stop trying.
To pay through the nose - Paying money for something which is not worth that amount.
Cat get one's tongue - Cannot speak due to nervousness.
Give someone the benefit of the doubt- Trust what someone says.
Under the weather- sick, slightly unwell or in low spirits.
Birds of a feather flock together- People who are alike are often friends (usually used negatively).
Break the ice- Make people feel more comfortable
Don't count your chickens before they hatch- Don't count on something good happening until it's happened.
Don't cry over spilt milk- There's no reason to complain about something that can't be fix
Don't put all your eggs in one basket- What you're doing is too risky
Every cloud has a silver lining- Good things come after bad things
Give someone the cold shoulder- Ignore someone
Look before you leap- Take only calculated risks
Spill the beans- Give away a secret
You can't judge a book by its cover- This person or thing may look bad, but it's good inside
Leave no stone unturned- Look everywhere
On cloud nine- Very happy
Make hay while the sun shines- Take advantage of a good situation
We see eye to eye- We agree
Break a leg- wishing good luck