golden opportunity; perfect chance
A formal or emphatic way to say 'the best possible opportunity'. Often used in news, business, or strategic contexts.
Now is the perfect chance.
He didn't miss the golden opportunity.
チャンス is a casual loanword for 'chance' or 'opportunity'. 絶好機 is more formal and emphatic.
Compound of 絶好 (zekkou, 'the best') + 機 (ki, 'opportunity').