transitive verb1: to make twice as great or as many: as a: to increase by adding an equal amount b: to amount to twice the number of c: to make a call in bridge that increases the value of odd tricks or undertricks at (an opponent's bid) 2 a: to bend or fold (as a sheet of paper) usually in the middle so that one part lies directly against the other part b:clench<doubled his fist>c: to cause to stoop 3: to avoid by doubling :elude 4 a: to replace in a dramatic role b: to play (dramatic roles) by doubling 5 a (1): to advance or score (a base runner) by a double (2): to bring about the scoring of (a run) by a double b: to put out (a base runner) in completing a double playintransitive verb1 a: to become twice as much or as many b: to double a bid (as in bridge) 2 a: to turn sharply and suddenly; especially: to turn back on one's course <the rabbit doubled back on its tracks>b: to follow a circuitous course 3: to become bent or folded usually in the middle —usually used with up<she doubled up in pain> 4 a: to serve an additional purpose or perform an additional duty b: to play a dramatic role as a double 5: to make a double in baseball