In Hawaiian, maka kilo means "observing eyes".

Had there been any glow from within the house, the opening of that door might have been discerned by keen, observing eyes.

Presently, however, his observing eyes discovered something which did arouse his keen interest.

The smoker observed Silas silently, bright blue eyes peering from under bushy red brows.

He lay there, listening to the noises in the street, quite tranquilly; not caring much how the time went, but watching it and watching everything about him with observing eyes.

The shape was a living one, but too elusive for observing eyes to follow.

Chapter 87 Glittering Stone: Fortress with No Name Oh, so alert the observing eyes when Lady and I opened the shadowgate.

Instead, Klondike observed eyes that had narrowed; lips that formed a harder grin.

He could feel the pressure of coldly observing eyes.

She watched the infants for a few minutes without doing anything, observing wide-open mouths and scrunched-up eyes.