To manage means to direct, control, or organize people, things, or activities. It can also mean to succeed in doing something difficult or with limited resources.
From Italian 'maneggiare' meaning 'to handle', especially horses, from Latin 'manus' meaning 'hand'. The idea moved from physically handling things to handling responsibilities and people.
Managing started as literally having something 'in your hands'. When you say you can 'manage it', you’re claiming you can get a grip on a situation, not just objects.
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