This is the 61st most frequent Marathi word.
फक
The Marathi word "फक" generally means "chaff" or "husk."
Here, 'फक' (simply) is used to emphasize straightforwardness or simplicity in the action being advised.
त्याने फक शांत राहण्याचा सल्ला दिला.
He simply advised to stay calm.
In this context, 'फक' (just) highlights that the statement was not serious and had no other intention than humor.
ते फक एक विनोद केले होते.
That was just a joke.
Here, 'फक' (only) is used to indicate a small quantity or a limiting action.