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Sentence

しばらくピアノを弾ひいていなかったので、腕うでが鈍にぶった。

Span Details

for a while; for some time

adverb, interjection

piano (instrument)

を

object marker

grammar

play (a stringed or keyboard instrument)

-> 弾くgodan verb

ongoing or resultant state

-> ているgrammar

negative auxiliary

-> ないgrammar

past tense or completed action

腕うでが鈍にぶった。

become less capable; lose one's touch; get rusty

-> 腕が鈍るexpression, verb