what means " self- steen"?
I saw this term in my english class but I don't know what means.

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I think you saw or heard 'self esteem' which means having respect for yourself.

e.g. Getting the job was good for her self esteem.

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I think it is self-esteem.
and it means what you think of yourself 
how you value yourself ( it could emotionally, mentally etc etc all sorts of levels)

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I think you mean "self-esteem", which is how you feel about yourself