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bottom tool

noun
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Definition of bottom tool

1 : a tool held under a piece of work and used in conjunction with another tool working on top (such as the lowermost of a pair of dies or fullers)
2 : a tool for machining the bottom of a hole

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“Bottom tool.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bottom%20tool. Accessed 26 Feb. 2021.

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