腹の皮が突っ張れば目の皮がたるむ

はらのかわがつっぱればめのかわがたるむharanokawagatsupparebamenokawagatarumu

expression · godan verb

1. one becomes sleepy when one's stomach is full
2. full stomach, sleepy head
3. when the skin of the belly is extended, the skin of the eyes droops

Study it in Yanamino