負まけじと

adverb

not to be outdone; refusing to lose; determinedly

Expresses a competitive or stubborn spirit: doing something with the determination not to be beaten by someone else's action or effort. Often used when someone responds in kind after seeing another person do something.

See also: じ

• 彼かれが走はしり出だしたので、私わたしも負まけじと走はしった。

  He started running, so I ran too, not to be outdone.

• 友とも達だちが新あたらしいスマホを買かったので、負まけじと私わたしも買かい換かえた。

  My friend bought a new smartphone, so I got one too, determined not to be outdone.