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2.
when your friend, pal, colleague, cheerleader, or someone of a close affinity is by your side (either figuratively or literally) to makes sure that you make it through the troublesome, difficult, or tedious time or predicament you are currently in.
craig: oh, arianna, are you ok?
arianna: i just can't get this cheer down. I don't think I'll be able to do the perfect cheer.

craig: You can do it! I know you can! I got your back.
by arianna-opc August 14, 2011
 
1.
1) An expression assuring someone that you are watching out for them. Comes from making sure you are safe by watching what's behind you when you're busy looking ahead.

2) Can be converted to a threat: "Watch your back," from the possibility someone might injure or kill them from behind when they aren't lookin.
Iono about dis...

Don't trip, Son. I GOT YOUR BACK.
by Joshiro007 February 18, 2003
 
3.
When someone has your back, they are there to support you unconditionally. When life seems to blindside you with undesirable events, they’re there for you without complaint, supporting you in your moment of need, not for their own selfish, self gratifying reasons, but because your well being to them is foremost in their mind and heart. A lover not only does the above, but is flexible in mind and heart to make the necessary changes and sacrifices in their own lives if they know it is something that enhances yours.
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Someone that has your back recognize the goodness, even the greatness in you, especially during the moments you’re not willing or able to see it. Simply stated, when someone has your back, your life is greatly enhanced.
You have some big obstacles to go through, but remember I've got your back.
by Urbanguru October 23, 2014
 
4.
This originally came from old movies and TV shows where two people are in a dangerous situation (usually hunting criminals or other enemies), and one of them is going to venture forward. The other person stays behind and watches for any danger coming from behind or other directions that the first person is unlikely to see. The one who stays behind typically has a weapon, to fend off any attackers.
person 1: "I'm going to look behind that garage."

person 2: "Alright, I've got your back."
by gorkin July 01, 2014