2 Old HSK word(s): ☊联盟 ** C ☊同盟 ** C
不结盟* * 海誓山盟* * 加盟* * 结盟* * 盟* * 欧盟* * 歃血为盟* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

歃 smear one's mouth with blood of a victim when taking an oath
血 blood / radical number 143
为 do, handle, govern, act / be
盟 swear / oath, covenant, alliance
Hsk Characters: 盟 *
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual
盟 76DF + 盟 + + swear / oath, covenant, alliance 皿 明 Household utensils 明 (HELL) meng2 +

Korean:

盟 + 盟 맹세할 맹 (a vow, a pledge, an oath)
1 NHSK word(s): 联盟* 6 lian2 meng2alliance/ union/ coalition
KOREAN6000 word(s):
0 KOREAN 2500 New HSK words):
0 KOREAN Sentence(s):