The phrase "gives high sign" can be defined as a gesture or signal indicating approval or agreement. To find antonyms for this phrase, one could consider gestures or signals indicating disapproval or disagreement. Examples may include a shake of the head, a thumbs-down gesture, or the crossing of arms. Alternatively, antonyms for "gives high sign" may include phrases expressing disagreement or disapproval, such as "veto," "reject," or "disavow." It is important to note that using an antonym for "gives high sign" does not necessarily indicate a negative connotation; rather, it signifies a different attitude or perspective.