Correct
螳臂当车
/ táng bì dāng chē /
Strokes
Definition
a mantis trying to stop a chariot (idiom)/to overrate oneself and attempt sth impossible/also written 螳臂挡车[táng bì dǎng chē]
Example
Definition
a mantis trying to stop a cart from advancing—overestimate oneself and try to hold back an overwhelmingly superior force; overestimate one's own strength