For Halloween, The Teacher introduces you to three idioms connected with fear:

* shaking like a leaf -

to shake a lot because you are nervous or frightened (usually in continuous tenses). I saw her just before her talk and she was shaking like a leaf - http://idioms.thefreedictionary.com/shake+like+a+leaf

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* scared stiff -

extremely frightened Jill awoke from a dream that left her afraid - scared stiff, in fact.

Etymology: from the idea that you are stiff (unable to bend or change your position) because you are too frightened to move -

http://idioms.thefreedictionary.com/scared+stiff)

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* it sends shivers up and down my spine - to make someone feel very frightened or excited

Now watch the whole video:

The Teacher's Halloween Special from bbclearningenglish.com with video and text downloads available