阴阳合同

yīn yáng hé tóng

a deal where the parties collude to sign an under-the-table "yin contract" 陰合同|阴合同 as well as an ostensibly genuine "yang contract" 陽合同|阳合同 in order to deceive authorities

yīn

variant of 陰|阴[yin1]

yáng

positive (electric.)

variant of 合[he2]

tóng

like