Today's Chinese word of the day is 左 which means left (the direction, not the past tense of go).
In Mandarin 左is pronounced Zuǒ.
在左邊 Zài zuǒbiān means on the left.
Next time you're in a dark place and your Chinese friend can't see you but can hear you you can answer:
我在你的左邊 Wǒ zài nǐ de zuǒbiān - I'm on your left. Unless of course you aren't... in which case fix that then say it.