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She filled the glass with water.
She made the glass full by adding water.
to make or become full
He filled the bag with groceries.
He made the bag full by putting groceries inside.
The room filled with people quickly.
The room became full of people very fast.
Can be used both transitively (with an object) and intransitively (without an object).
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Often used with 'out' to emphasize completion.
'Fill' can be used both with and without an object. For example, 'She filled the cup' (transitive) and 'The room filled with smoke' (intransitive).
Remember common collocations like 'fill out a form', 'fill in the blanks', and 'fill up the tank'.
From Middle English 'fyllen', from Old English 'fyllan', from Proto-Germanic 'fullijaną', from 'fullaz' (full).
The past tense and past participle of 'fill' is 'filled'.