guess a riddle; 猜着一个谜语
I should guess his age at 50. 我猜他有50岁了。
I suspect that he is more or less involved in the affair. 我猜他和这件事有点牵连。
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)