Completely or totally full; filled to capacity without any remaining space.
Compound formation from 'full' plus 'up,' common in informal speech to emphasize complete fullness. The construction reflects how English speakers create intensified forms by combining words.
The phrase 'full up' is a great example of how spoken English evolves—we say it all the time, but it's fighting to be recognized as a real word against 'simply full,' which comes from formal writing.
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