Watch your six

Watch out for danger behind your back (like you might get jumped or something).

Watch your back.

Keep an extra set of eyes on the back of your head.

Dude, be careful man. Watch your six.

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Watch your six

Watch your back.
Keep an eye on what could be behind you.
Turn around and look.

Yo bro, watch your six!

cover/watch your six

Military term for watching/covering your back/rear side

Stay frosty and cover/watch your six!