마구

Etymology 1
derived from. Original meaning: "blocking; stopping up; intending to block or stop up". The etymology is no longer transparent.

Adverb

 * 1) carelessly, recklessly, indiscriminately, at random
 * 2) violently, severely, badly, wildly

Etymology 2
.

Noun

 * 1)  insane curve ball/breaking ball

Etymology 3
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