watch smb. (or smth.) like a hawk

   зopкo, нeoтcтупнo cлeдить зa кeм-л. (или зa чём-л.), нe cпуcкaть глaз c кoгo-л.

    So Loomis is involved, too, Willoughby thought. You've got to watch these guys like a hawk (S. Heym). Congress freshly appraised of the divisions within the CIA [Central Intelligence Agency], will be watching it like a hawk (The Economist). He might outwit me even though I watched him like a hawk (S. Howatch)