Correct spelling, explanation: the verb sustain comes from Latin sustinere, which means hold, bear. There is no consonant b in this word, nor pronunciation pointing to b existing in the word, so
substain is an incorrect form. Sustainis the only correct spelling.
Definition of sustain:
verb, to hold up
We need a new campaign to sustain profitability.
Less water should be wasted to sustain our planet.
Incorrect spelling, explanation: this form is a misspelling, maybe done due to prefix sub- which exists in English. However here the correct form is sustain, not
substain. Sustain comes from Latin sustinere, so you can see that there was no b in the original form either.
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