A bear with a sore head
irritated sore mood
A bit of a dark horse
A person with hidden abilities
A bitter bill to swallow
a difficult fact to accept
a different kettle of fish
a totally different situation from the one that was just mentioned
a dogs life
a difficult hard life
a fish out of water
somebody who feels uncomfortable
A long shot
a wild guess or a risk
A memory like a sieve
A poor memory
A night owl
A person who stays up late
A pain in the neck
An annoying person
A piece of cake
Something very easy to do
A red rag to a bull
Something that is likely to provoke
a red~letter day
A very important day
A sitting duck
An easy target
A storm in a teacup
A lot of fuss about something that is not important
A wild-goose chase
A hopeless search
