Pretending not to see something; deliberately ignoring a problem or wrongdoing even though one is aware of it (also expressed as 見て見ぬふり).
子どもが泣いているのに、母親は見ぬふりをした。
Although the child was crying, the mother pretended not to see.
上司は部下の小さなミスに見ぬ振りをすることが多い。
The boss often turns a blind eye to his subordinates' minor mistakes.
社会問題を知りながら見て見ぬふりをするのはよくない。
It's not good to turn a blind eye to social issues while being aware of them.