胸むねを貸かす

expression, godan verb (-su)

allow a less skilled person to practice with one; be a practice partner for a weaker player

Primarily used in sumo, where a higher-ranked wrestler lets a lower-ranked wrestler practice against him. Can be extended to other sports or skills where a stronger person helps a weaker one train.

See also: 胸を借りる

• 横よこ綱づなが若わかい力りき士しに胸むねを貸かした。

  The yokozuna allowed the young wrestler to practice with him.

• 先せん輩ぱいが胸むねを貸かしてくれたおかげで、だいぶ上じょう達たつした。

  Thanks to my senior letting me practice with him, I improved a lot.