The portion of the face below the eyebrow and above the eyelid.
The Friar's eyes now seemed to burn no more with light, but looked out stern beneath his underbrow's concave; his voice was grave; he stood erect as if to soar above his natural height:1971, Bernard D. N. Grebanier, The Angel in the Rock, page 62:
A distinctive feature is the sharply defined underbrow which extends downward over an upper cheek bulge at the outer corner of the orb.2000, Native Peoples A to Z - Volume 1, page 209:
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Some women need a highlighter shadow on the underbrow, a second shadow on the orbital bone, and a third on the lid.2011, Carole Jackson, Color Me Beautiful, page 130:
2
The lower portion of the eyebrow.
Her big eyes are framed with brows that are almost bushy— the top part of the brow is left alone, only the underbrow is tweezed to give the brow an "angle."1954, Motion Picture - Volumes 87-90:
Brush them, they are more important than you realise, and keep the underbrow well plucked and tidy.1975, Country Life - Volume 157, page 1018:
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Use wax as an underbrow cleanup and always tweeze for the shaping or arching you need.1976, Diane Von Furstenberg, Evelyn Portrait, Diane Von Furstenberg's Book of Beauty, page 157:
underbrow
adj
/ˌʌndə(ɹ)ˈbɹaʊ/
Etymology From under + brow.
1
Of the act of looking With the brow lowered.
Black eyebrows and eyes so dark and scrutinizing (but he was being scrutinized too) as to give the face a sinister expression, especially through a sly underbrow manner of switching the eyes from one object to another.1976, Alfred Leslie Rowse, A Cornishman Abroad, page 93:
'Snitch,' he muttered as he gave his daughter a comical underbrow glance.1995, Emma Richmond, A Family Closeness, page 58:
2 more examples
Ben had shot her the underbrow look that told her she was in for a lecture.2014, Diana Hamilton, A Spanish Vengeance:
They all looked dirty and unkempt, the girls with long greasy hair, theboys ditto, two with sideburns. The sloppy, dirty clothes, the bare feet, the sullen underbrow stares.2014, Dell Shannon, Unexpected Death:
underbrow
adv
Etymology From under + brow.
1
From beneath a lowered brow.
He looked underbrow at me.1970, Richard Llewellyn, White Horse to Banbury Cross, page 207:
He clasped his hands, looking at me, not exactly underbrow, but still accusingly.1989, Richard Llewellyn, But We Didn't Get the Fox, page 271: