Give (one) a fair crack of the whip British noun phrase informal
If a person "gives one a fair crack of the whip", he/she gives someone an equal opportunity to do something or to succeed in something.
She felt that she hadn't been given a fair crack of the whip, so she lost the match.
You're not giving me a fair crack of the whip, but you've accused me of stealing your phone?
All the students will be given a fair crack of the whip in this competition.
The verb "give" should be conjugated according to their tense.
The expression "fair crack of the whip" is used elsewhere but is recorded earliest in Australia, from 1902 onwards.