Verb
watch like a hawk (third-person singular simple present watches like a hawk, present participle watching like a hawk, simple past and past participle watched like a hawk)
(transitive, simile) To observe (someone or something) closely and keenly.
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