Wiktionary
vb. 1 to furnish with equipment 2 to arm oneself with a weapon, especially a gun.
Usage examples of "tool up".
Already I hear word from the street that the Dolgoruki have been told to tool up for a major gang war.
I released him from my mouth and licked his tool up one side and down another, giving my jaw a brief respite before parting my lips again.
Then he walked to Christian, who stood passively waiting, and he held the special tool up to Christian's throat.
Talut held the small sewing tool up and examined it from all angles, nodding his head with admiration.
Both the German invasion of France and the fighting in the North African desert had shown severe deficiencies in British armor, but the same old obsolescent models kept getting made because they did work, after a fashion, and England had no time to tool up to build anything better.
The spring lanyard spooled the tool up snugly beneath his right arm.