Then the lawless one will be revealed, whom the Lord will kill with the breath of his mouth, and bring to nothing by the brightness of his coming;
Slay with the breath of his mouth ... "Here is an expression found nowhere else in the New Testament."[6] The reference would appear to be to the word of the Lord.  When the New Testament was stripped out of the dead languages in which it had been concealed, in the times of Wycliffe, Tyndale, Luther, and others, there was a sense in which the man of sin received a mortal wound.  There is also a possible rendition of "slay" as "consume," as in Adam Clarke's quotation, below, indicating that the power and glory of the man of sin will not perish instantly, but gradually, being continually eroded, wasted away, and "consumed" by the breath of the Lord's mouth, by his word.  Clarke said: