One or more observers in an area of interest.
line of country
One's area of specialization or interest.
bat one's eyes
To signal or feign by fluttering one's eyelids, as romantic interest.
give someone the eye
To show flirtatious signs or sexual interest/attraction with one's eye…
common ground
A characteristic or interest shared by multiple people or systems; any…
ground ball with eyes
A weakly hit ground ball that barely evades the infielders.