Major league (pertaining to the highest level of professional sports). / Major league (significant, important).

(slang) To a significant degree; on a large scale.

collaborating (with)

plural of bush league

plural of minor league

(archaic) A besieger.

plural of leaguerer

The highest division of English football.

(soccer) The highest-level European club football (soccer) tournament, organised by UEFA.

simple past tense and past participle of leaguer