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もしそれが興奮させなかったら [もしそれがこうふんさせなかったら]

If it was not exciting (Expressions (phrases, clauses, etc.))

背中;背なか [せなか]

back (of body) (noun (common) (futsuumeishi))

背中で教える [せなかでおしえる]

to teach by example/to teach by showing/to teach with one's back (Expressions (phrases, clauses, etc.), Ichidan verb)

背中の痛み [せなかのいたみ]

backache (noun (common) (futsuumeishi))

背中を出す [せなかをだす]

to bare one's back (Expressions (phrases, clauses, etc.), Godan verb with `su' ending)

背中を流す [せなかをながす]

to rinse one's back (Expressions (phrases, clauses, etc.), Godan verb with `su' ending)

背中合わせ;背中合せ [せなかあわせ]

(noun (common) (futsuumeishi))

(1) back to back

(2) discord/feud

(3) opposite sides of the same coin