blind punching; random firing; haphazard attack
Metaphorical use: acting without aim or plan, like a blind person striking out. Often used in contexts of shooting, fighting, or making unguided attempts. The term めくら is now considered sensitive when referring to people, but this compound is still used idiomatically.
Even if you punch blindly in the dark, you won't hit anything.
He started the work haphazardly, like random firing, without a plan.
Standard kanji spelling. Note that 盲 (めくら) is a sensitive term for blindness; this compound is used metaphorically.
Mixed kana-kanji spelling sometimes seen.
Compound of 盲 (めくら, 'blindness') and 打ち (うち, 'striking'). The metaphorical sense of acting blindly or randomly is derived from the literal image of a blind person striking out.