take the bit in teeth
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take the bit in (one's) teeth
To do something decisively and with resolve. A reference to a horse that is no longer under the rider's control because the bit (part of the apparatus used to guide it) is out of place in its mouth. Once Sophie takes the bit in her teeth, she's the best student in my class.
take the bit in one's teethand take the bit between the teeth
to put oneself in charge; to take charge. Someone needed to direct the project, so I took the bit in my teeth. If you want to get something done, you've got to take the bit between your teeth and get to work.