Of the highest rank

An area reserved for taxi cabs to await customers. / (Britain) The system whereby barristers must accept a brief if they are the first available when one comes up.

(idiomatic) To assert one's authority over a subordinate who disagrees.

Alternative spelling of rank and file

Belonging or pertaining to the rank and file.

(military) To march or charge out of the designated order in a military unit. / (idiomatic) To publicly disagree with one's own group or organization.

(military) To close the spacing between lines (ranks) of troops, as they are deployed across a battlefield, thereby decreasing the depth of the formation as it faces the enemy side.

plural of taxi rank

(informal, business) A model of employee productivity in which workers are ranked into the top 20 percent, the adequate 70 percent, or the bottom 10 percent, and those in the bottom group are fired.

(military, chiefly in the plural) A soldier who is not a commissioned officer.