Comparative form of chatty; more inclined to chat or talk; more talkative than something else.
From chatty (chatting + -y) with comparative form -er. The spelling change from 'y' to 'i' before the comparative suffix follows standard English rules.
The shift from 'chatty' to 'chattier' shows how English comparative forms have specific spelling rules—the 'y' becomes 'i' before suffixes, which is why we say 'chattier' not 'chattyer'!
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