IPA: /ˈbɪziər/
KK: /ˈbɪziər/
More occupied or engaged than usual or compared to someone or something else.
She is busier than ever with her new job responsibilities.
Busier → It is formed from 'busy' (from Old English 'bisig', meaning occupied or active) and the comparative suffix '-er' (meaning more). The word 'busier' means more occupied or more active than another.
Think of someone who is 'more active' or 'more occupied' — that's what 'busier' means.