noun, noun or participle which takes 'suru'
Used in sports contexts (e.g., tennis, badminton) for a powerful overhead shot; also used figuratively for a crushing defeat or a great success. As a suru-verb, スマッシングする means 'to smash'.
彼のスマッシングは強力で、相手は返せなかった。
His smashing was so powerful that the opponent couldn't return it.
試合で彼
He smashed many times during the match.