redouble

transitive verb redoubled, redoubling

1. 1. to make twice as much or twice as great
   2. to make much greater; intensify: redouble your efforts
2. to make echo or reecho
3. to refold; double back
4. Archaic to repeat

intransitive verb

1. to become twice as great or twice as much
2. to reecho
3. to turn backward, as on one's tracks
4. Bridge to further increase the point value or penalty of a bid which an opponent has doubled

noun