3 Old HSK word(s): ☊倍 ** A ☊倍数 ** D ☊百倍 ** D
成倍* * 加倍* * 事半功倍* * 双倍* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

双 set of two, pair, couple / both
倍 times, fold, multiple times

Hsk Characters: 倍 *
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual
倍 500D + 倍 + + times, fold, multiple times 人 倍 Man 倍 (-FALTIG) bei4 +

Korean:

倍 + 倍 곱 배 (곱: double, two times)
1 NHSK word(s): 倍* 5 bei4(two; three etc) -fold/ times (multiplier)/ double/ to increase or multiply
KOREAN6000 word(s):
1 KOREAN 2500 New HSK words):
倍 + bèi 배. 배수. 곱절. 갑절. bae. baesu. gobjeol. gabjeol.
0 KOREAN Sentence(s):