espy
To find out or observe (someone or something, especially if not easy to see) by spying or looking; to catch sight of; to see; to spot.
To see (someone or something) without foreplanning or unexpectedly.
(obsolete) To observe (someone or something) as a spy; also, to examine or observe (someone or something) carefully; or to look out or watch for.
(obsolete) To become aware of (a fact, information, etc.).
(archaic) To observe as a spy, to spy; also, to examine or observe carefully; or to look out or watch.
An act of finding out or observing by spying or looking; an espial or espying.
A scout or spy.
The act or process of learning secret information through clandestine means; espionage.