double

White Fangとブルドッグの闘いはまだ続いています。
The bull-dog missed by a hair's-breadth, and cries of praise went up as White Fang doubled suddenly out of danger in the opposite direction.
The time went by. White Fang still danced on, dodging and doubling, leaping in and out, and ever inflicting damage.
"double" は何らかの動きを示す様ですね。 "on the double" は知っていますが、その意味と関係があるのでしょうか？　辞書を見ます。
・Merriam-Webster: to turn sharply and suddenly; especially : to turn back on one's course: the rabbit doubled back on its tracks
・Infoplease: to turn back on a course or reverse direction (often fol. by back): He doubled back by another road and surprised us.
急に向きを変えると言う事ですね。
ブログの記録を見ると "double" を含んだ表現は幾つも取り上げていました。参考にその記録を下に列記します。
2/4/2014 double-time gesture: a fast march of 180 paces to the minute/a slow running pace, keeping in step
9/24/2013 Doubling back: to turn and go back in the direction you have come from
9/16/2013 double: to clench
4/4/2011 double take: to react after a slight pause
1/11/2010 double bind: situation requiring a choice between equally undesirable alternatives
"double" の意味は "double meaning" どころでは無いですね。