Correct
信笔
/ xìnbǐ /
Strokes
Definition
to write freely/to express oneself as one pleases
Example
As a Verb
wield one's pen deftly; write at random
1
Xìn
信
bǐ
笔
xiě
写
lái
来
write freely/aimlessly
2
Xìnbǐ
信笔
xiě
写
chū
出
jī
几
háng
行
shī
诗
throw off a few lines of verse