因头

jiè yīn tóu

借因头

use an excuse

zhǎo ge yīn tóu

找个因头

find an excuse

zhè chū xì wǒ bù xiǎng kàn jiù jiè ge yīn tóu chū qu le

这出戏我不想看，就借个因头出去了。

I didn't like the play, so I found an excuse and left.