noun
A favorable moment or opening to do something; common in written and news-style Japanese, especially in phrases such as 好機を逃す and 好機と見る.
彼は好機を逃さず、新しい事業を始めた。
He did not miss the chance and started a new business.
今こそ計画を実行する好機だ。
Now is the right opportunity to put the plan into action.
A Sino-Japanese compound: 好 means 'good' or 'favorable,' and 機 means 'occasion, opportunity, or turning point.' This is a component-based explanation of the spelling, not a detailed historical derivation.