If you are categorical about something, you state your views very definitely and firmly.
①He is quite categorical that the UN should only help the innocent civilian population.
②Some experts say such a position of categorical deniability is driven by pragmatism.
①Yingluck has repeatedly and categorically rejected the request.
②I denied the allegation immediately, categorically and unequivocally.
hook, line and sinker
believing something completely, usually something that is not true.
①Yeah, he fell for it hook, line and sinker . Didn't doubt it for a minute.
②Satan has been telling you he is god for a long time, and you've fallen for it hook, line, and sinker .
从以上两个例句可以看出这个短语通常与“fall for ”搭配，表示“彻底相信....”
我们前几天还在讲泰勒的it's time to go的那片文章中提过短语“by hook or by crook”想方设法;不择手段 【If someone says they will do something by hook or by crook, they are determined to do it, even if they have to make a great effort or use dishonest means.】
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They intend to get their way, by hook or by crook .