Definition
To be 'dependant upon' something means relying on it for essential support or existence. It highlights a state of needing assistance, whether financially, emotionally, or physically. Think of a vine 'dependant upon' a trellis for support. It's subtly different from 'dependent' as 'dependant' more often refers to a person who relies on someone else. In essence, 'dependant upon' underscores a critical reliance, implying vulnerability without the support.