bit between one's teeth noun2 •Complete control of a situation; a stance that cannot be controlled or restrained by anyone else.If he was to get the bit between his teeth after he had got ordained and bought his living, he would play more pranks than ever he, Theobald, had done. — 1903 •A large degree of focus and commitment to a task.When my father had the bit between his teeth he would work all day and half the night, barely stopping to eat, snapping at anyone who interrupted him. — 2010
