the back of a body or object / to turn one's back / to hide something from / to learn by heart / to recite from memory / unlucky (slang) / hard of hearing
to press from either side / to place in between / to sandwich / to carry sth under armpit / wedged between / between / to intersperse / to mix / to mingle / clip / folder / Taiwan pr. [jia2]
lightning / electricity / electric (bound form) / to get (or give) an electric shock / phone call or telegram etc / to send via telephone or telegram etc