Made double; duplicated.

In music, reinforced by its octave: said of a tone in a melody or a chord.

adjective. rendered twice as great or twice as many.

adjective. folded in two.

verb. Simple past tense and past participle of double.

adjective. twice as great or many

"For example, in this study, they are including people who are what they call doubled up, meaning you had problems with your home, you moved in with a sister or you lived with your parents, and you have children there."

doubled pawn  

multiple  

bubbled  redoubled  troubled  untroubled  

conduplicate  creased  crimped  diploid  dog-eared  

double