Watch your six!

What does “Watch your six” mean?

Be careful of what is behind you. It comes from military talk, where “six o'clock” means directly behind.

• Live and let live./lɪv ənd let lɪv/
• No sweat./noʊ swet/
• I'm gonna be rich./aɪm ˈɡʌnə bi rɪtʃ/
• Money is no object./ˈmʌni ɪz noʊ ˈɑːbdʒekt/
• Potato, potato./pəˈteɪtoʊ pəˈtɑːtoʊ/
• No one but you./noʊ wʌn bʌt ju/
• You wanna make out?/ju ˈwɑːnə meɪk aʊt/
• You look stunning./ju lʊk ˈstʌnɪŋ/