to be a downer
to be a depressing
to pull an all-nighter
sudying or working all night
hush-hush
to be very secretive
to bad mouth
to talk about something in a negative manner
to be a third wheel
to be an unnecessary person in a situation
to be an early bird
to get up always early
to catch some Z's
to take a nap
to be all ears
to listen carefully
to be a chicken
to be a coward
having guts
having courage to do something
a mix-up
amisunderstanding
no-brainer
obvious