大牙

xiǎo hái r zhǎng le yī kē xīn de dà yá

小孩儿长了一颗新的大牙。

The child has a new molar.

jiào rén xiào diào dà yá

叫人笑掉大牙

make a laughing-stock of oneself

wǒ de dà yá bèi zhuàng diào le

我的大牙被撞掉了。

My front tooth was knocked out.