on the lookout
Constantly alert, intent on finding something or someone.
Synonym: on the outlook
I'm on the lookout for a good example of a Roman dinar from the 1st century. Let me know if you hear of one anywhere.
A coquette is like a recruiting sergeant, always on the lookout for fresh victims. Douglas William Jerrold
I'm always on the lookout for something good about people. Often months go by. Andy Rooney
Women are always eagerly on the lookout for any emotion. Stendhal
When I meet a new person, I am on the lookout for signs of what he or she is loyal to. It is a preliminary clue to the sense of belonging, and hence of his or her humanity. Haniel Long
To be a surrealist means barring from your mind all remembrance of what you have seen, and being always on the lookout for what has never been. Rene Magritte
One cry of "Thief!" and the whole marketplace is on the lookout. Nigerian Proverb