the upper hand
noun [ S ] uk/ˌʌp.ə ˈhænd/ us/ˌʌp.ɚ ˈhænd/
C2 上风；有利位置
If you have the upper hand, you have more power than anyone else and so have control.
After hours of fierce negotiations, the president gained/got/had the upper hand. 经过几个小时的激烈谈判，总统最终占了上风。