Walter was obliged to lower the overall height of the dome in order to broaden the platform.
They've broadened the road and made a passing lane.
Her grin broadened, her whole face warming.
His arms broadened, his face stretched until it was beastly.
WordNet 3.0 Sense Numbers: 1, 4
NOTE: compare carefully to sense 1; in this sense, examples similar to sense 1 (ex, broaden the base) entail extending a scope (including more resources or competitors), while in sense 1, the broadening only refers to widening the space (not necessarily including any more elements)
To broaden the base of support for students, some schools have been partnering with local businesses.
They will encourage such activity in order to broaden the base of competition.
This broadened the road for the Reich's economic penetration in many markets.
Does it make sense to broaden the focus of a research project?
The new Smithsonian exhibit broadens idea of portraiture.
Yahoo broadened the newspaper ad deal.
Works by these artists broaden the exhibit to include experiences from black and Latino history.
WordNet 3.0 Sense Numbers: 2, 3