► 接尾辞
っこ [っこ] [coll] meaning: mutual rank: 3
☆ お風呂で二人で洗いっこした ⇨ We washed each other in the bath
☆ 恨みっこ無しにしよう ⇨ No hard feelings mutually, OK?
っこ [っこ] [～っこない] [coll] [peer] meaning: no way rank: 3
☆ そんなことありっこない ⇨ There’s no way such thing exists, can happen
☆ そんな事できっこない ⇨ There’s no way you can do that. It is absolutely impossible