コウ, さら, さら.に, ふ.ける, ふ.かす

grow late, night watch, sit up late, of course, renew, renovate, again, more and more, further

JLPT3 G7 S7 F861

As per # (spread) + action indicator → stretch a rope (compare the derivative character , a rope attached to a well bucket). The meanings *replace* and *change* likely owe to the drawing of fresh well water to replace that which has been used, or dried up. (Still) *more* and *further(more)* are borrowed meanings, as are *grow late* and *stay up late*.

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