play something by ear
do something without a plan
pull one's leg
joke or tease someone
see eye to eye
agree
(by the) skin of one's teeth
just barely
thick in the head
not very intelligent
to stab someone in the back
to say nasty things about someone when they are not there
to have a bun in the oven
to be pregnant
the naked eye
if something can be seen with the naked eye, it can be seen without the help of a microscope
in the blink of an eye
extremely quickly
turn a blind eye
to ignore something that you know is wrong
itchy feet
to be restless and have a strong desire to travel
to put your feet up
to relax
achilles heel
small fault or weakness in a person or system that can result in its failure
skeleton in the closet/cupboard
hiding a shocking secret about yourself
to be/get tongue-tied
that you get when you can't seem to find the right words to say, and so you are unable to speak
