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costlier▼◼◼◼[UK: ˈkɒst.lɪə(r)] [US: ˈkɒst.liər]
expensive▼◼◼◼adjective[UK: ɪk.ˈspen.sɪv] [US: ɪk.ˈspen.sɪv]
costly [costlier, costliest]▼◼◼◼adjective[UK: ˈkɒst.li] [US: ˈkɑːst.li]
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