adverb taking the 'to' particle, taru-adjective
vigilantly watching for an opportunity; with an eagle eye
Describes a state of watching intently and patiently, like a tiger eyeing its prey, waiting for the right moment to act. Often used with と and verbs like 狙う or 見守る.
He is vigilantly eyeing the president's position, waiting for his chance.
Rival companies are eagerly watching for an opportunity to enter the market.