bit between one's teeth
To face up resolutely to a hard task: “Ralph is having a difficult time in medical school now, but once he takes the bit between his teeth, there's no stopping him.” The bit is the part of a bridle that fits into a gap between the teeth in the back of a horse's mouth. By pulling on the reins, which in turn pull the bit back against the horse's mouth, the rider is able to stop or turn the horse. If the horse takes the bit between its teeth, it can't be stopped.
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Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
In his view, a writer has only one duty: to be present in his books.
Yet this, in the end, is a book from which one emerges sad, gloomy, disenchanted, at least if we agree to take it seriously.
In a bit of foreshadowing, he repeated that opinion in November.
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He alludes to it as one of their evil customs and used by them to produce insensibility.
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