/ë/ is inserted as a transition sound between /n/ and /w/.
/wa/ is realized as /o/.
/w/ is elided in final position.
/y/ is inserted as a transition sound between /e/ and /o/.
Note: the literal meaning is "go with" although the expression is understood as referring to marriage. "Go with" is the sense of dating was not part of the culture for the last generation of native speakers.