Correct

放一把火

/ fàng yī bǎ huǒ /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/放一把火-Chinese-idioms-Cchatty-0afc85bb-baae-4ee5-ad78-bdf8842295fb-1612777388.jpg

Collocation

1
火放了好几把
2
放了好几把火
3
放了一把火
4
应该放一把火
5
给某处/某事放一把火

Definition

放一把火

Literally means:

set a fire

Actually means:

take an unconventional action

It figuratively means taking an unconventional action to touch people so that they will respond accordingly. Commendatory.

比喻作出某种打破现状的举动,让人受到触动,并在行动上作出必要的反应。具有褒义色彩。

Example

Used as predicate or object. It can have othe words in between, and can be used in the form of inversion (作谓语、宾语,中间可以插入别的词语,也可以倒装)
1
Zhè
jiā
yínháng
银行
de
shàngshì
上市
  
,
gěi
piào
股票
shìchǎng
市场
fàng
le
huǒ
  
,
niǔzhuǎn
扭转
le
ruǎn
疲软
de
zhuàngtài
状态
  

The banks' listing has set the stock market on fire and reversed its weakness.

2
shàngrèn
上任
jiù
fàng
le
huǒ
  
,
shāodiào
烧掉
cūnmín
村民
men
de
mèi
愚昧
lǎnduò
懒惰
  
,
rán
燃起
men
他们
jiānchuàng
艰苦创业
de
zhì
志气
  

As soon as he took office, he set a fire to the ignorance and laziness of the villagers and ignited their ambition to work hard.

3
Zuìjìn
最近
chídào
迟到
de
xuésheng
学生
yuèláiyuè
越来越
duō
  
,
kànlai
看来
yīnggāi
应该
fàng
huǒ
  
,
cái
néng
gǎibiàn
改变
zhèzhǒng
这种
liáng
不良
de
miàn
局面
  

More and more students have been late recently, so it seems that a fire should be set in order to change this bad situation.