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Sentence analysis
7Spans
Sentence
Span Details
気が緩ん
relax one's mind; feel at ease; become careless; let one's guard down-> 気が緩むexpression, verb
で、
connective te-formgrammar
うっかりミス
careless mistake; honest mistake; slip-upnoun
を
object markergrammar
し
light/support verb with a noun or noun-like phrase-> するgrammar
てしまっ
completion or regret-> てしまうgrammar
た。
past tense or completed actiongrammar