Idiom: Castles in the air

Please find below the link and list of all the idioms done so far:


WOLF IN A SHEEP'S CLOTHING
https://youtu.be/GLJ9x8fJlt0

TO HIT BELOW THE BELT
https://youtu.be/6VrpZLrzSkI

MAKE ONE'S MARK
https://youtu.be/DBvEcy6L7jU

CASTLES IN AIR
https://youtu.be/kulAV-6GDZ8

TO KEEP AT ARM'S LENGTH
https://youtu.be/4mXXbCtq80g

BED OF ROSES
https://youtu.be/1-oBaJCsgQU

TO SMELL A RAT
https://youtu.be/hMqucg56P-o

FROSTING ON THE CAKE
https://youtu.be/ikKAJjTzuRc

TO WEAR YOUR HEART ON YOUR SLEEVE(S)
https://youtu.be/YnC90WLRur8

TO LET THE CAT OUT OF THE BAG
https://youtu.be/dx3LtSAuOXI

TO SLEEP LIKE A LOG
https://youtu.be/AZeyI_KXA-M

CROCODILE TEARS
https://youtu.be/35xmKP9zed0

JACK OF ALL TRADE
https://youtu.be/QPPrUUfSQFM

A COLD FISH
https://youtu.be/SL9Nq1lm_K8

ON PINS AND NEEDLES
https://youtu.be/uNJNNJW2gR4

SKELETON IN THE CLOSET
https://youtu.be/lLo9jSX5w14

CAN OF WORMS
https://youtu.be/Lkd62aciBYQ

TO SEPARATE THE SHEEP FROM THE GOATS
https://youtu.be/ynOgr2QvCqw

A SMART COOKIE
https://youtu.be/PfmM4x6-hIs

TO READ IN BETWEEN THE LINES
https://youtu.be/O09GdTOSMf8

TO GET ON SOMEONE'S HAIR
https://youtu.be/WaRZ0mbJLic

TO ROB SOMEONE BLIND
https://youtu.be/QIAZgYoXdB4

WITH A HEAVY HEART
https://youtu.be/D4Bd5bF3gbs

SALT OF THE EARTH
https://youtu.be/M-_T1zpwCgU

BURY THE HATCHET
https://youtu.be/HjofDZpVdBg

Thank you
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