话头

shí qǐ huà tóu

拾起话头

take up the thread of a conversation

bō zhuǎn huà tóu

拨转话头

change the subject

dǎ duàn huà tóu

打断话头

interrupt somebody

bǎ huà tóu lā huí zhèng tí

把话头拉回正题

return to the subject

nǐ yī zhí zài zhuǎn wān mò jiǎo de bǎ huà tóu yǐn dào zhè ge wèn tí shang

你一直在转弯抹角地把话头引到这个问题上。

You've been leading up to this one question.