To have a bun in the oven.
to be pregnant
Turn a blind eye.
to ignore something wrong
Break a leg
good luck
To stab someone in the back.
to betray someone
To see eye to eye
to agree
Over my dead body!
only when I die
To cost an arm and a leg
very expensive
An old hand!
an experienced person
To be head over heels.
completely in love
It's my flesh and blood.
my relative
Keep your chin up!
don't despair
You are pulling my leg!
You're joking
To get cold feet!
be nervous before a big event
In the blink of an eye.
very quickly
To put your feet up.
to relax
To be thick in the head.
not very intelligent
To have a skeleton in the closet/cupboard.
hidden secret
to play something by ear.
do something without a plan