The antonyms for the phrase "gave one's consent" can include "refused," "rejected," "disapproved," "denied," and "opposed." These words indicate a lack of agreement or approval for a particular action or decision. Alternatively, synonyms for "giving consent" could include "allowing," "approving," "endorsing," or "agreeing with." It is essential to understand the meaning behind words and phrases to ensure proper communication and mutual understanding in any situation. Whether giving or withholding consent, clear communication is crucial to avoid confusion and ensure everyone's wishes and needs are respected.