1blue 
/ˈblu:/ adjective
blu·er; blu·est /ˈblu:/ adjective 1 : having the color of the clear sky
▪ a blue house/car/shirt/pen ▪ his bright blue eyes ▪ the deep blue ocean — see also baby blue, black-and-blue, cobalt blue, navy blue, royal blue, sky blue, true-blue 2 : sad or unhappy
▪ Are you feeling blue? — see also blues
▪ a blue house/car/shirt/pen ▪ his bright blue eyes ▪ the deep blue ocean — see also baby blue, black-and-blue, cobalt blue, navy blue, royal blue, sky blue, true-blue
▪ Are you feeling blue? — see also blues
blue in the face
◊If you do something until you are blue in the face, you do it for a very long time without having any success or making any difference.
▪ I talked to him until I was blue in the face, but he wouldn't listen to me.
▪ I talked to him until I was blue in the face, but he wouldn't listen to me.
blue with cold or blue from the cold
chiefly Brit, of a person or body part : blue from being exposed to cold for too long
▪ Her hands and feet are blue with cold. ▪ He was shivering and blue from the cold.
▪ Her hands and feet are blue with cold. ▪ He was shivering and blue from the cold.
go blue
Brit : to turn blue from being cold or not breathing
▪ The baby stopped breathing and went blue.
▪ The baby stopped breathing and went blue.
talk a blue streak
US : to talk rapidly and without stopping
▪ Sheesh! Your friend really talks a blue streak!
▪ Sheesh! Your friend really talks a blue streak!
— blue·ness noun [noncount]
▪ the blueness of the ocean
▪ the blueness of the ocean
