卯眼

dǎ mǎo yǎn

打卯眼

drill a mortise

záo mǎo yǎn

凿卯眼

chisel a mortise

yuán mǎo yǎn

圆卯眼

round mortise

sǔn tou de dà xiǎo hé mǎo yǎn bù fú wú fǎ luò cáo

榫头的大小和卯眼不符，无法落槽。

The tenon does not conform to the mortise, so it can not fit into the mortise.