Giving a high sign can be a positive and affirmative gesture, but sometimes, it may not be appropriate to communicate through this method. In such cases, it is necessary to resort to other forms of communication that convey the opposite meaning or antonyms of a high sign. These may include gestures such as shaking one's head, crossing one's arms, or making the "thumbs down" signal. Conversely, facial expressions, such as a frown or a scowl, may also convey a negative sentiment better than a high sign. Using these antonyms for a high sign can help avoid miscommunication and ensure that the intended message is conveyed clearly and accurately.