gain〔get〕 the upper hand (over)
处于有利地位get the advantage (over sb)
Don't let your feeling get the upper hand over you.不要感情用事。

用作定语
▲～+n.
 He is a member of the upper house of legislature.他是上议院的成员之一。
His upper arms are strong.他的上臂很强壮。