Correct

倍增

/ bèizēng / 
Strokes

Definition

to double/to redouble/to increase many times over/to multiply by a factor/multiplication

Example

As a Verb

double; redouble; multiply

1
Xìnxīn
信心
  
/
yǒngqì
勇气
bèizēng
倍增

with doubled confidence/courage