| moving up(expression, piggyback, upsurging, tripling) |
| mushroom(verb, increase, develop, swell, grow) |
| nurture(verb, raise, produce, breed, cultivate) |
| open(verb, increase, develop, swell, enlarge) |
| open out(verb, expression, increase, develop, swell) |
| opening out(expression, piggyback, upsurging, tripling) |
| outspread(verb, increase, develop, swell, mount) |
| pad(verb, increase, develop, swell, enlarge) |
| piggyback(verb, increase, develop, swell, mount) |
| pile up(expression, piggyback, upsurging, tripling) |
| piling up(expression, piggyback, upsurging, tripling) |
| prolong(verb, increase, develop, swell, enlarge) |
| protract(verb, increase, develop, swell, enlarge) |
| puff up(verb, expression, increase, develop, swell) |
| puffed up(expression, piggyback, upsurging, tripling, pouched) |
| puffing up(expression, piggyback, upsurging, tripling, pouched) |
| pyramid(verb, increase, develop, swell, enlarge) |
| run up(expression, piggyback, upsurging, tripling) |
| slap on(verb, expression, increase, develop, swell) |
| snowball(piggyback, upsurging, tripling) |