跪乳

guìrǔ
(literary) (of a lamb) to kneel to suckle at the breast (used as a metaphor for filial piety)

CEDICT

literary

Entry Composition

1 跪 guì to kneel
2 乳 rǔ
  1. (bound form) breast
  2. (bound form) milk
  3. (bound form) newborn; suckling