答应结婚，订婚;结婚
to (promise to) marry
What could be more romantic than plighting your troth on a deserted beach?
While her best friend played the harp, Emma plighted her troth to Graeme.
A record number of couples have plighted their troth at Gretna Green this year.
She was set to plight her troth to a local landowner.
It was at around that time that Rosemary and the Brigadier had plighted their troth.
Compare: engaged (MARRIAGE)betroth
See also: plight verb