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
quilt / by / (indicates passive-voice clauses) / (literary) to cover / to meet with / (coll.) (since c. 2009) used before a verb that does not accurately represent what actually happened, to describe with black humor how sb or sth was dealt with by the authorities (as in 被自殺|被自杀[bei4 zi4 sha1])