cum grano salis
Literal translation: with a grain of salt
More common meaning: with a little disbelief, not too seriously
In an English sentence: I took my friend’s boasting cum grano salis.
You treat something cum grano salis when it sounds a little too good to be true. Similarly, when you take something lightly instead of seriously, you are taking it cum grano salis.
From Elizabeth Heimbach's book Latin Everywhere, Everyday