If you tell a lie, you need more lies to make up it.
参考:
if you tell a lie, you may need more such lies to patch it up.
e.g: 圆谎
patch up a lie
once you lied, you have to tell more lies to cover it.
Once lying,you will need to tell more lies to patch it up.
If you told a lie, then you must tell more lies to cover it up.