| increase(verb, boost, swell, grow, mount) |
| intensify(verb, advance, increase, raise, rise) |
| magnify(verb, advance, increase, raise, rise) |
| multiple(adjective, treble) |
| multiply by three(verb, expression, idiom, treble) |
| redouble(verb, advance, increase, raise, rise) |
| reinforce(verb, advance, increase, raise, rise) |
| sharpen(verb, advance, increase, raise, rise) |
| step up(verb, expression, advance, increase, raise) |
| strengthen(verb, advance, increase, raise, rise) |
| three-fold |
| trebled |
| trebly |
| triangle(noun, three, trio, triptych, troika) |
| triplication(noun, triplication) |
| advance(verb, increase, raise, rise, extend) |
| aggrandize(verb, advance, increase, raise, rise) |
| amplify(verb, advance, increase, raise, rise) |
| annex(verb, advance, increase, raise, rise) |
| augment(verb, advance, increase, raise, rise) |