当头

Traditional form:

當頭

Pinyin (reading):

dàngtou

Definitions:

• (coll.) pledge; surety

Characters:

• 当 - appropriate, timely; to act, to serve; the sound of bells
• 头 - head; chief, boss; first, top

Traditional characters:

• 當 - appropriate, timely; to act, to serve; the sound of bells
• 頭 - head; chief, boss; first, top