don't know; to have no clue

Slow play

Gesture

Position

Classification

Action description

Turn one palm skywards, and touch your chest with the back of the hand. Slide the hand down your chest as you turn the palm inwards. Shake your head for disapproval as you repeat the sign several times.

Example sentence

He can even cut a key. He tries everything. He didn't go to school but he is not stupid. He learns everything I taught him. He is really smart and he even does more research by himself. He is great.
When he was studying, I had thought about being his coach. But since I thought he didn't know who I was at that time, I didn't put my thoughts into practice. After a while, he was out of school.
Did you just drill a hole and put it on it? It takes a lot of time and effort. You are brainy. You do research if you have no idea what it is. You are smart for figuring out how to categorize.
We have asked Lao Li to come. Maybe he has something to do so we haven't seen him yet. It's five o'clock already and we have no idea whether he will come or not.
Today is Saturday. Maybe he went out? I don't know. Maybe.

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