Here's the answer:
“老”
(lǎo)
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 93.91% of the time!
(lǎo)
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 93.91% of the time!