The symbol “~” appears in many definitions. What does it mean? Examples:
2 纯;专:专~。~心~意。
https://www.zdic.net/hans/%E4%B8%80
1 头的前部,脸:脸~。颜~。~目。~~相觑。
https://www.zdic.net/hans/%E9%9D%A2
2 旧时指读书人:~子。~民。学~。
https://www.zdic.net/hans/%E5%A3%AB
UPDATE: And, what does it mean when there are two consecutive swung dashes? Such as in: “~~相觑。”