piece of cake
very easy
under the weather
not feeling well; sick or ill
rise and shine
Time to get out of bed and get ready for work/school; wake up
keep your chin up
Remain cheerful/joyful in a difficult situation
tickled pink
very happy
butterflies in "ones" stomach
to be very nervous and anxious
bend over backwards
to try very hard to help/please someone
in the same boat
in the same {bad} situation
end of the road
a point where you cannot continue any further; the end of something; final outcome
break a leg
to wish someone good luck
like the back of my hand
know a something [like a place] really well