(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
反
fǎnㄈㄢˇ
contrary; in reverse; inside-out or upside-down; to reverse; to return; to oppose; opposite; against; anti-; to rebel; to use analogy; instead; abbr. for 反切 phonetic system[cedict]