Doubled is a past tense and past participle form of a word "DOUBLE."
Double- 1. Become twice as much or as many.
2. Move at twice the usual speed; run.
3. Fold or bend (paper, cloth, or other material) over on itself.
4. Pot (a ball) by making it rebound off a cushion.
5. Sail round (a headland).
6. Be used in or play another, different role.
7. Add the same note in a higher or lower octave to (a note).
Poonam's income has been doubled.