Idioms and Phrases......

A wild goose chase ; An absurdly hopeless enterprise
A bee in one's bonnet ; Be obsessed with something
A bolt from the blue ; Unexpected
A rainy day ; A time of need
All at sea ; Confused
A flash in the pan ; A Success that is not repeated
A square peg in a round hole ; an unusual individualist who could not fit into his niche in his/her society
A thorn in the side ; Perpetual source of trouble
All and sundry ; Everyone without exception
At one's wits end ; Desperate
Arm chair theory ; Impracticable theory
By fits and starts ; Irregularly
Chip of the old block ; Very similar to his father
Have an axe to grind ; Have a selfish purpose
In the pink of condition ; In a weak condition 
In the doldrums ; Depressing
Keep your hair on ; Think forcefully

Lock Stock and Barrel ; Completely
On the cards ; Probable
Struck Several Patches ; Had many professional difficulties
Sword of Damocles ; An imminent danger
To eat humble pie ; To apologise
To be hard up ; To be short of money
To cry wolf ; To give false alarm
To leave one in the lurch ; To desert one in times of difficulty
To spilt hairs ; To make useless distinctions in arguments
To get the sack ; To get dismissed from the job
To take the wind out of one's sails ; To deprive one's argument of all force
To be up to the eyes ; Be very busy
To have a card up one's sleeves ; To have secret plan in reserve
To tread on eggs ; To walk carefully
To tell tales out of school ; Reveal confidential matters
To give someone apple pie ; To flatter someone
To burn one's boat ; To take an irreversible decision
To burn the candle at both ends ; To waste money lavishly
To do up ; To make tidy
To catch a tartar ;  To fight a strong enemy
To have two strings to one bow ; To have more than one alternative
To have a ball at one's feet ; Have the power to decide something
To back bite ; To talk behind the back
To die in harness ; To die while still working or active
To feather one's nest ; To make money through unfair means
To flog a dead horse ; To waste energy on some already rejected activity 
Wet behind the ears ; Cunning