寸草心

cùncǎoxīn ㄘㄨㄣˋ ㄘㄠˇ ㄒㄧㄣ

    • a child's love and gratitude towards parents

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
the heart of an inch of grass
Meaning
A child's love and gratitude toward parents, from a Tang poem comparing it to grass repaying spring sunlight. Warm and literary.

Sources