あいくち

Compound of 合い (ai, “fitting together”, 連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 合(あ)う (au, “to fit together, to match, to go well together”).) +‎ 口 (kuchi, “mouth; opening”).[1][2][3]

• (Tokyo) あいくち [àíkúchí] (Heiban – [0])[2]
• IPA^(key): [a̠ikɯ̟ᵝt͡ɕi]

あいくち • (aikuchi) 

1. 合口, 合い口: compatibility, rapport, or cooperativeness in anything done together with others
2. 合口, 合い口: getting along well with others, affinity

   Synonym: 相性 (aishō)

3. 合口, 合い口: the join or fit between stones or bricks in masonry or other wall building

   Synonym: 合端 (aiba)

4. 合口, 合い口: the join or fit between a lid and a container
5. 合口, 合い口: a style of constructing a 短刀 (tantō, “short sword; dagger”) without a crossguard, so that the hilt fits directly against the opening of the scabbard
6. 匕首, 合口, 合い口: a specific type of dagger with no crossguard, where the hilt fits directly against the opening of the scabbard, often kept concealed in one's clothing

• Thesaurus:短刀