dead set

idiom

Definition of dead set

: firmly determined The mayor was dead set against [=strongly opposed to] the plan. She was dead set on [=completely certain about] going to college.

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“Dead set.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dead%20set. Accessed 25 Nov. 2020.

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