Japanese

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For pronunciation and definitions of せんせん – see the following entries.
潺潺
[adjective] murmuring, bubbling (river etc.) (abbr. 潺々)
戦線
[noun] frontline
宣戦
[noun] declaring war
[verb] to declare war
(This term, せんせん (sensen), is the hiragana spelling of the above terms.)