To look blue

Related to To look blue: blue book
to look disheartened or dejected.

See also: Blue

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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They advise only going to A&E or calling 999 if your child is struggling to breathe, their skin starts to look blue or grey or they are unusually quiet and still.