搭头

wǒ mǎi le gè dà guā zhè ge xiǎo guā shì dā tou

我买了个大瓜，这个小瓜是搭头。

I bought a big watermelon, with the small one as a supplement.

tā shuō huà jiàn xiē shí zǒng ài yòng e huò èng zhī lèi de huà dā tou

他说话间歇时总爱用“呃”或“嗯”之类的话搭头。

He used such mannerism as "er" or "uh" to fill in a pause.