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make inroads upon (something)▼verb[UK: ˈmeɪk ˈɪn.rəʊdz ə.ˈpɒn ˈsʌm.θɪŋ] [US: ˈmeɪk ˈɪnroʊdz ə.ˈpɑːn ˈsʌm.θɪŋ]
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