To support or uphold something together with another person or entity, sharing the effort of maintaining or keeping something going.
From Latin 'co-' meaning 'together' and 'sustain' from Old French 'sustenir', from Latin 'sustinere' meaning 'to hold up or support'. The prefix 'co-' indicates joint action.
This verb appears in environmental and sustainability writing, where 'cosustain' emphasizes that protecting ecosystems requires multiple parties working together—it's more than just individual sustainability.
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