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Results found in several dictionaries: Collins, Collaborative Dictionary
peacock-blue  adj azul  inv  (de) pavo real

Collaborative Dictionary     English-Spanish
! i feel blue q. Estar triste, deprimido, estar bajo de moral.  
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'peacock-blue' also found in translations in Spanish-English dictionary
la bacaladilla nm. blue whiting Reverso General Dictionary 
azul claro exp. light blue Reverso General Dictionary 

"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"