Correct

臣服

/ chénfú / 
Strokes

Definition

to acknowledge allegiance to (some regime)/to serve

Example

As a Verb

submit oneself to the rule of sb; be subjected to the rule of sb; acknowledge allegiance to sb

1
Wúxū
无须
chénfú
臣服
yú
于
dàguó
大国
  
。

There is no need to acknowledge allegiance to a big power.

As a Verb

serve a ruler as his subject