Darkcircles under the eyes are inevitable at this time of year.
Times, Sunday Times (2014)
Too many toxins put a strain on the liver and kidneys, and this often manifests itself in blemishes and darkcircles.
Times, Sunday Times (2008)
Definition of 'circle'
circle
(sɜːʳkəl)Explore 'circle' in the dictionary
countable noun
A circle is a shape consisting of a curved line completely surrounding an area. Every part of the line is the same distance from the centre of the area.
Definition of 'dark'
dark
(dɑːʳk)Explore 'dark' in the dictionary
adjective
If you describe something as dark, you mean that it is black in colour, or a shade that is close to black.
darklyadverb [ADVERB after verb, Also ADV adj/-ed]