noun
red team
Refers to a team designated by the color red, commonly in school sports days or the NHK Kōhaku Uta Gassen (Red vs. White song contest).
See also: 青組 (あおぐみ)
運動会で、私は赤組に入った。
At the sports day, I was on the red team.
紅組の応援団がとても盛り上がっていた。
The cheering squad for the red team was really fired up.
Compound of 赤/紅 (aka, 'red') and 組 (kumi, 'group, team'). The reading あかぐみ is a straightforward combination.