Arm up

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Arm up 

means to prepare yourself for a challenge — physically, mentally, or emotionally.  It often implies getting ready for a conflict, a tough situation, or anything where you’ll need strength, skill, or protection.

Examples:

1- As the storm approached, the whole neighborhood armed up—boarding windows, gathering supplies, and looking out for the elderly.

2- Before going into that meeting, she armed up with facts and stats—no one was going to catch her off guard.