でんかのほうとうをぬ
Meanings
Expression
Verb (5-dan, く)
Idiomatic
1. to employ one's secret weapon; to play one's trump card; to use the ace up one's sleeve
Composed of
one's last resort; trump card; treasured family sword
to pull out; to draw out; to omit; to leave out; to do to the end; to carry through; to let out (e.g. air from a tyre)