The phrase 'be filled' is commonly used to describe the state of being fully occupied or saturated with something. There are several synonyms for this phrase, including 'be brimming', 'be overflowing', 'be jam-packed', 'be crammed', 'be teeming', 'be swarming', 'be chock-full' and 'be bursting'. All these synonyms convey the idea of being completely full and unable to hold any more. These words can be used interchangeably in a variety of contexts, ranging from descriptions of physical containers to people's emotional state. When used creatively, these synonyms can add depth and variety to writing, making it more engaging and interesting to read.