What does 雄于 in 少年雄于地球，则国雄于地球 (from a Liang Qichao quote) mean? As I understand, 梁启超 (Liáng Qǐchāo) is a famous Chinese patriot, who opposed imperialism and European influence prior to and during World War I.  My teacher mentioned a quote from him (少年强则中国强), so I looked it up and found this:


  少年强则国强，少年智则国智，少年富则国富，少年独立则国独立，少年自由则国自由，少年进步则国进步，少年胜于欧洲，则国胜于欧洲，少年雄于地球，则国雄于地球。
  梁启超 (source)


Each part of this quote has a similar structure, e.g., 少年强则国强, which means something along the lines of "strong youth leads to strong country".

However, I don't understand 雄于 in this quote.  I've only ever encountered 雄 previously in 英雄 ("hero").  I didn't find anything meaningful on YouDao or Jukuu, so I'd guess 雄于 is particular to this quote.

Question: What does 雄于 in 少年雄于地球，则国雄于地球 mean?
雄 as a verb has the meaning of 'be dominant'

少年雄于地球 = (If our) youths are dominant on Earth

则国雄于地球 = Then (our) nation will be dominant on Earth