eye to / on / for the main chance

/ˈaɪ tʊ ˌɒn fɔː ðə mˈeɪn tʃˈans/

/ˈaɪ tʊ ˌɑːn fɔːɹ ðə mˈeɪn tʃˈæns/

a willingness to use any given opportunity or situation to one's advantage

Examples

1. One must have an eye on the main chance in order to succeed.

2. This company tends to employ young women have an eye to the main chance.