This is the 83rd most frequent Dutch word.
werden
"Werden" means "to become" in English.
In this sentence, 'werden' is used to indicate a transition or change of state, meaning 'became' in English.
Ze werden ineens erg stil.
They suddenly became very quiet.
In this context, 'werden' is part of the passive voice construction, indicating that the plans were made by someone.
De plannen werden door het team gemaakt.
The plans were made by the team.
Here, 'worden' refers to something coming to be or happening, meaning 'to become' in English.