股掌之上

gǔzhǎngzhīshàng
  1. (figurative) in the palm of one's hand; under one's complete control
  2. in the palm of one's hand; under one's complete control

Wiktionary

Entry Composition

1 股掌 gǔzhǎng
  1. (have sb in) the palm of one's hand
  2. fig. (under) one's complete control
2 之上 zhīshàng above