Big Nose - French expression 1

Have a big nose to smell good deals. This is a spinoff of Ivan on Tech's "Big Boy Pants ». French expression. To have the delicacy of taste that would come from the world of hounds where the dog with a fine nose is able to hunt in all weathers. From the dog, this expression has passed to man to designate the one who is perceptive and who has flair to smell the good deals. Thanks Ivan - Like your work