"以言词或文字抨击" can be translated into English as "to attack with words or in writing" or "to criticize/denounce verbally or in writing".
Here are some example sentences to illustrate the usage:
* He often attacks his opponents with harsh words in public debates.（他在公开辩论中经常用严厉的言辞抨击对手。）
* The article denounced the government's policies in no uncertain terms.（这篇文章毫不含糊地以文字抨击了政府的政策。）
* She criticized his behavior verbally during the meeting.（她在会议上以言词抨击了他的行为。）