Present participle of heft; the act of lifting or testing the weight of something.
Present participle formed by adding -ing to 'heft,' which is how English creates progressive tenses and gerunds, allowing us to describe actions in progress or as concepts.
The -ing form is maybe the most versatile suffix in English—'hefting' can mean 'he is hefting' (action in progress) or 'hefting is difficult' (the action as a noun). This efficiency is why English speakers depend on it constantly.
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