punch above your weight
US /pʌntʃ əˈbʌv jʊər weɪt/
UK /pʌntʃ əˈbʌv jʊər weɪt/

1.
超常发挥, 做超出自己能力范围的事
to perform or compete at a level that is higher than one's apparent capabilities or resources
:
•
Despite being a small company, they managed to punch above their weight and win the big contract.
尽管是一家小公司,他们还是成功地超常发挥,赢得了大合同。
•
The new player is really punching above his weight, scoring goals against top defenders.
这位新球员真是超常发挥,面对顶级后卫也能进球。