not know the meaning of the word वाक्य

After a weekend of violence between Israelis and Palestinians threatened to spill across the region, President Hosni Mubarak of Egypt appealed Sunday for Arab restraint, saying that " those who speak of war do not know the meaning of the word ."
"If Bill Clinton really thinks Bob Dole's courageous decision to leave the Senate amounts to ` giving up'the fight to change this country, then this president must not know the meaning of the word ` sacrifice'_ but I guess Bill Clinton proved that long ago,"