bolster broaden develop enlarge grow increase open spread swell widen aggrandize amplify bloat burgeon detail diffuse dilate distend elaborate embellish explicate fatten heighten hike inflate lengthen magnify mount multiply mushroom pad piggyback prolong protract pyramid stretch thicken unfold unfurl unravel unroll wax beef up blow up bulk up fan out fill out open out outspread puff up slap on soup up spread out stretch out tack on upsurge