The phrase "drop a note" is commonly used to refer to leaving a short message or contacting someone through a written or typed communication. Antonyms of this phrase may include "ignore," "forget," or "neglect to write." These antonyms indicate a lack of action or attention towards communicating with someone through written means. Other antonyms may include "receive a message," "get in touch," or "connect with." These antonyms reflect the opposite action or intent, indicating a desire or effort to communicate with someone through written or typed means. Ultimately, the antonyms of "drop a note" highlight the importance of effective communication and the various ways in which we can connect with one another.