like a hawk
(simile) With particular vigilance or attention, implying sharp vision.
If you find one you like, plan to guard it like a hawk until the purchase is finalized.
Conventional wisdom is not to put all of your eggs in one basket. 80/20 wisdom is to choose a basket carefully, load all your eggs into it, and then watch it like a hawk. Richard Koch
And then there's all these other creeps that surround your band and suck off you like leeches and try to manipulate you and your business. You have to watch like a hawk. I'm always ready to fight. I see it very much as a battle. Shirley Manson
Like a hawk about to devour its prey, the wings of public opinion hover above the head of the judge. All the Court's decisions are disguised and indirect forms of pleading at the bar of public opinion. Malcolm de Chazal
In this world of ours, the sparrow must live like a hawk if he is to fly at all. Hayao Miyazaki
And you can cage the songbird, But you can't make her sing. And you can trap the free bird, But you'll have to clip her wings. `Cause she'll soar like a hawk when she flies, But she'll dive like an eagle when she dies. Elton John
Some things are worth the fat and calories, although I have to watch it like a hawk. Megyn Kelly