プログレッシブ和英中辞典(第4版)の解説
ぐち【愚痴】
an idle complaint
愚痴っぽい
grumbling／grumbly／querulous ((about))
いつも人の仕事振りに愚痴を言う
She always 「complains to [grumbles at] people about their work.
愚痴をこぼす
complain ((about))；grumble ((about, over))
妻は愚痴ひとつこぼさず母の面倒を見てくれました
My wife took care of my mother without a single complaint.