HSK 7-9
导火索
dǎohuǒsuǒ名
fuse (for explosive)
一次误会成了争吵导火索。
Yí cì wù huì chéng le zhēng chǎo dǎo huǒ suǒ.
A misunderstanding became the fuse for the argument.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.