Verb (5-dan, う, intransitive)
1.  to meet (by chance);  to come across;  to run across;  to encounter;  to happen upon
出遭う usu. has a negative connotation
2.  to meet (e.g. of rivers, highways, etc.)
esp. 出合う
3.  to emerge and engage (an enemy)
often used imperatively as 出会え