Sentence:  Rod didn't quite understand her reaction. 'I thought you were happy at Owl's Nest? I thought you loved it here?' 'I do. But we've been here long enough. It's been two years since it was finished. We always said we'd move on. Onwards and upwards, that's what you said. <WSD>Don't let the grass grow under your feet</WSD>, you said. 
Meaning of the word marked with <WSD> tags:  To settle in one place rather than moving to another.