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eke out▼(to supplement)
verb
[UK: iːk ˈaʊt] [US: ˈiːk ˈaʊt]

round out▼(To make more complete by adding details)
verb
[UK: ˈraʊnd ˈaʊt] [US: ˈraʊnd ˈaʊt]

supplement [supplemented, supplementing, supplements]▼(to provide or make a supplement to)
verb
[UK: ˈsʌ.plɪ.ment] [US: ˈsʌ.plə.mənt]

augment [augmented, augmenting, augments]▼(to increase, make larger or supplement)
verb
[UK: ˈɔːɡ.ment] [US: ɒg.ˈment]

complement [complemented, complementing, complements]▼(to complete)
verb
[UK: ˈkɒm.plɪ.mənt] [US: ˈkɑːm.plə.mənt]