grain of salt
To “take something with a grain of salt” is to view a statement with a skeptical attitude. “She took the claim that he didn't want to be president with a grain of salt.”
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Examples from the Web for grain of salt
From his expression it was evident that Grain-of-Salt had no faith in the Government.
"You'll see if he isn't cunning," said Grain-of-Salt, holding out his full glass.
Grain-of-Salt would not give one sou over fifteen francs for the wagon.
But Grain-of-Salt would not consent to do this; he declared that the distance was too far for him.
If she had been able to endure the odor in Grain-of-Salt's shack, she would probably be able to bear it here.