乱打 is read as らんだ (randa) and means hitting.
らんだ
randa
みだれうち
random pounding (e.g. on a drum)
らんよう
abuse
らんぼう
rape
みだれる
to lapse into chaos (due to war, etc.)
みだす
to throw into disorder
らんざつ
disorder
らんぶ
boisterous dance
らんりつ
standing (for election) in (excessively) large numbers
らんばい
underselling
らんぱつ
random firing
らんちょう
confusion
みだれ