Here's the answer:
“小心!”
(xiǎo-xīn!)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 95.99% of the time!
(xiǎo-xīn!)
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 95.99% of the time!