Noun
A striving; an effort; a conatus.
Source: Webster's dictionaryMinos attacked Megara but Nisus knew he could not be beaten because he still had his lock of crimson hair. Source: Internet
Nisus was King of Megara, and he was invincible as long as a lock of crimson hair still existed, hidden in his white hair. Source: Internet
Nisus died and Megara fell to Crete. Source: Internet