This is the 189th most frequent Hebrew word.
הוסיף
"Added" or "to add."
The word 'הוסיף' is used to express adding something tangible to something else, in this case, salt to soup.
הוא הוסיף מלח למרק.
He added salt to the soup.
The word 'הוסיפה' is used to indicate adding information to a statement, describing speech.
היא הוסיפה שהיא רוצה להגיע מוקדם יותר.
She added that she wants to arrive earlier.
The word 'הוסיפו' is used to show adding extra effort or quantity, in this instance, additional hours.