permanent blue
noun
(The colour of) artificial ultramarine.
Origin
Mid 19th century.
- undertenant
- under the auspices of
- under the banner of
- under the baton of
- under the cosh
- under the counter (or table)
- under the gun
- under (the) hatches
- under the heel of
- under the impression that
- under the influence
- under the microscope
- under the name (of)
- under the open sky
- under the pump
- under the rose
- under the skin
- under the sod
- under the sun
- under the table
- under the weather
- under the wire
- underthings
- underthrust
- undertint