Bedenken äußern — to voice concerns. German also says Bedenken erheben, geltend machen or anmelden: to raise, assert or register them, as one registers a claim.
Zu bedenken geben — to give someone something to consider. It is the polite way to put a concern on the table.
Bedenken ausräumen — to clear concerns away. It is the job of the person who wants the change.
Bedenkenträger — a carrier of concerns. The dictionary DWDS defines him as someone who has concerns, often exaggerated ones, about a plan or an innovation, and marks the word as often pejorative.
Wer schweigt, stimmt zu — whoever stays silent agrees.