The comparative form of 'chesty,' meaning more prominent, bold, or self-assertive in chest or demeanor.
From 'chesty' (meaning having a prominent chest or being arrogantly confident) with the comparative suffix '-er.' The base 'chesty' comes from 'chest' plus the adjective suffix '-y.'
'Chestier' perfectly shows how English builds words layer by layer—'chest' becomes 'chesty' (having chest qualities) which becomes 'chestier' (more of those qualities), all the way to 'chestiest.'
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