Adjective : a double portion; a new house double the size of the old one. ,double doors; a double sink. ,a double room. ,a double interpretation. ,a double blanket. ,double petunias; double hollyhocks.    From Dictionary.com. 

Noun : This dress is the double of that. He is the double of his cousin. ,He needed a double in the tenth frame to win.    From Dictionary.com. 

Verb (used with object) : The baby doubled its weight in a year. ,Double the edge over before sewing. ,He doubled his fists. ,Income doubled expenditure. ,to double Cape Horn. ,The players were doubled for the tournament. ,He doubled me into game. ,He doubled him to third. ,He doubled in the winning run.    From Dictionary.com. 

Verb (used without object) : My money doubled in three years. ,to double over with pain. ,He doubled back by another road and surprised us. ,She doubles as producer and director. ,The saxophonist doubles on drums.    From Dictionary.com. 

Adverb : There are only a few beds, so some of the children will have to sleep double for the night.    From Dictionary.com.