'In width' is a phrase used to describe the measurement of the horizontal dimension of something. Synonyms for 'in width' could include 'across', 'to the side', 'broad', 'wide', 'laterally', 'sideways', 'horizontally', 'widely', or 'breadthwise'. These words can be used to provide more variety and nuance in descriptions, such as 'the table is six feet wide', 'the tree branches extend laterally', or 'the painting measures twenty inches across'. Using synonyms can help writers add more depth to their descriptions, making them more engaging and memorable to readers.