略見一斑

略见一斑
lüèjiànbān
  1. lit. to glimpse just one spot (of the leopard) (idiom)
  2. fig. to get an inkling of the whole picture

CEDICT

看到一處斑紋可以想見樣子用以比喻看到事物一部分進而推想全貌

重編國語辭典

Entry Composition