Is that a No
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gestures and meanings
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vocabulary
    shake head,side to side or left to right
    shrug shoulders,
    yawn,means sleepy tired,bored
    cross arms, means angry,no
    nod head , no 
    wave hands
    cup ear
    finger to mouth
    furrow eyebrows
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grammar focus:degrees of probability
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                                            a little likely
it might/may mean he's bored                  maybe it means he's bored          
it could mean she's angry                        perhaps it means she's angry
it must mean he agrees                            it probably means he agrees
                                            very likely
A common saying in English is "action speak lounder than words",
it means that what you do it more import than what you say.

i presented my project outline to her.
she didn't make eyecontact with me once during the entire meeting.

pick up what  people are taking.
i don't mean to offend you.

referee
    referee make sure player  follow the fule of the game.
    
body language varies quite a bit from country to country.

in Asia, when gesturing for someone to come here,you should do it with your palm down.
in the U.S.,however,that might be misunderstood as "go away" because come here is usually
done with palm up.