留一手

Traditional form:

留一手

Pinyin (reading):

liúyīshǒu

Definitions:

• to deliberately withhold essential knowledge or skills as strategic insurance (typically to maintain leverage, avoid being replaced, or preserve authority in hierarchical relationships)

Characters:

• 留 - to stay, to remain; to preserve, to keep; to leave a message; 
• 一 - one; a, an; alone
• 手 - hand

Traditional characters:

• 留 - to stay, to remain; to preserve, to keep; to leave a message; 
• 一 - one; a, an; alone
• 手 - hand