British present participle of equalise; making equal or in the process of bringing things to the same level.
From equalise + -ing (present participle). The -ing suffix is consistent across both British and American English forms.
Fascinatingly, 'equalising' sounds identically between British and American speakers when pronounced, but it's spelled differently—this shows that pronunciation and spelling have genuinely diverged in modern English, making writing more regional than speech.
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