Wiktionary
vb. 1 (&lit qualifier=often to '''assume''' a given '''position''' English) 2 (context idiomatic US law enforcement English) To turn away, with your hands in a visible and unmovable position so that you can be searched
Usage examples of "assume the position".
When he gave her the signal, she almost bolted, but forced herself to assume the position.
I urge you to assume the position of admiral -- for the good of our galaxy.
I urge you to assume the position of admiral-for the good of our galaxy.
When the front-rank boy could stand no more, he would assume the position of the rearmost and the second boy would move up.
I will assume the position, of course, Hari said quietly, if necessary.
I believe Hidoro is cautiously in favor of the plan, so long as we stay discreetly in the background and never actually assume the position of power ourselves.