練
レン, ね.る, ね.り, ねり

practice, gloss, train, drill, polish, refine

JLPT2 G3 S14 F788

Originally 柬# (separate) + 糸 thread → separate silk threads, then process them into a finished product → *train* → *knead*; *gloss*; *polish*; *discipline*; *mature*; *season*. The present form replaces 柬 with 東.

[Full Kanji Etymology List]