Looks like no one added any tags here yet for you.
a bitter pill to swallow
a difficult fact to accept
a different kettle of fish
a totally different sitation from the one just mentioned
a red rag to a bull
action, comment, etc. liable to provoke sb
a red-letter day
a very important day
a sitting duck
an easy target
a storm in a teacup
a lot of fuss about sth that is not important
a wild-goose chase
a hopeless search
above board
honest
chop and change
keep changing (your mind)
in a tick
shortly, soon
a bear with a sore head
irritated/bad mood
a fish out of water
sb who feels uncomfortable
a long shot
a wild guess/ a risk
a memory like a sieve
a poor memory
a night owl
person who enjoys staying up late
a pain in the neck
annoying person/thing
a piece of cake
sth very easy to do
at large
free, not caught
for all I know
as far as I know
lose one's head
lose self-control
make one's blood boil
cause sb to become very angry
put one's heart and soul into sth
be devoted to sth
strike a chord
make sb feel sympathy
the year dot
a long time ago
turn over a new leaf
make a new start
a bit of a dark horse
person with hidden abilities
a dog's life
a difficult, hard life
Achilles heel
weakest point of sb's character
against all odds
despite the difficulties
agree to disagree
stop arguing because there is no chance of agreement
all along
from the beginning until now
all but
nearly, almost
all in
exhausted
all in all
when everything is considered
all the same
yet, however
all told
altogether; in total
an old wives' tale
false belief
an unknown quantity
person or thing that one has no experience of
as a last resort
when all else has failed
as the crow flies
in a direct line/ by a direct route
at close quarters
from a short distance
at the cutting edge
at the forefront of
bark up the wrong tree
have a false idea about sth
be ahead of one's time
have modern ideas
be all at sea
be in a state of confusion
be all fingers and thumbs
be awkward, clumsy
be all very well
appear satisfactory but in fact not be
be as busy as a bee
very busy
be as thick as a brick
be stupid
be beside oneself with anger
to be extremely angry
be born yesterday
be easily deceived/ naive
be broke
have no/very little money
be caught red-handed
be caught while committing a crime
be dying for sth
really want sth
be fit for
be good enough for
be for the high jump
about to be punished
be full of beans
be very lively
be green
be inexperienced
be in a quandary
be confused; undecided
be in sb's black books
out of favour
be in sb's shoes
be in sb's position
be in the dark about sth
be unaware of sth
be in the doghouse
be out of favour, in trouble
be in the know
be well-informed
be in the same boat
be in the same (usually bad) situation
be in two minds about sth
not be able to decide what to do
be on the cards
be likely to happen
be on the defensive
protect oneself because one feels insecure or threatened
be on the up and up
improve steadily
be out of practice
lacking practice
be over the moon
be elated
be second to none
be the best
be sound asleep
sleep deeply
be the apple of sb's eye
be very precious to sb; be sb's favourite
be the perfect image of sb
look exactly like sb
be the splitting image of sb
look exactly like sb
be thrown off balance
be surprised
be tickled pink
be really pleased
be up and about
have recovered from an illness
be up in arms
be very angry
be worn out
be very tired
be/get soaked to the skin
be/get very wet
be/have a close shave
barely avoid an accident/ a bad situation
bear fruit
be successful
beat about/around the bush
avoid saying what one means directly
beat sb black and blue
hit sb repeatedly until bruised
before one can say Jack Robinson
extremely quickly
beg the question
makes people want to ask a particular question
behind bars
in prison
behind the scenes
in secret
below the belt
cruel and unfair
bide one's time
wait for a good opportunity
big cheese
person with important job/position
big-headed
conceited; boastful
bite off more than sb can chew
try to do sth which is too difficult
black and blue all over
covered with bruises
black tie
formal clothing
blaze a trail
discover sth new
blessing in disguise
sth which appears bad at first but then turns out favourably
blow a fuse
become very angry