I often have heard my japanese colleagues a double て used. example, kuruma nottete, ushiro mitete, genba ittete.

what i know is single te is command but what does double te mean? does it make more stress or what?

yoroshiku onegai itashimasu


The second て form is the て form of the verb that is used after the first one which is いる in this case.

見てて → 見ていて

As for the meaning, there is a slight nuance but if you know the difference between the る and ている form, there should be no problem. It would be like saying in English:

後ろ見て : I looked back (and...)

後ろ見てて : I was looking back (and...)

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