two-bagger, two-base hit, two-baser
doubling
image, look-alike
stunt man, stunt woman
duplicate
duplicate, reduplicate, repeat, replicate
double over, double up
forked
bivalent
doubled, two-fold, twofold
dual, duple
dual, three-fold, threefold, treble, two-fold, twofold
doubly, twice
