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supplement
mastery UK /ˈsʌp.lɪ.mənt/ US /ˈsʌp.lə.mənt/nounverb
card 1 of 10 · preposition
There is an extra charge of $15 as a supplement _____ travel insurance.
card 1 of 10 · preposition
There is an extra charge of $15 as a supplement _____ travel insurance.