increase

[1]	grow , swell , enlarge , dilate , wax , expand , extend , distend , inflate , augment , snowball , enhance , heighten , raise , develop , multiply , burgeon/bourgeon , flourish , proliferate , spread , broaden , widen , lengthen
[2]	prolong , advance , further , improve , better , strengthen

[1]	addition , gain
[2]	increment , growth , enlargement , growth , expansion , extension , augmentation , enhancement , development , multiplication , proliferation , spread
[3]	addition , increment , increment , escalation , inflation , gain , rise , boost
[4]	on the increase , step-up , waxing , developing , growing , expanding , increasing , escalating , on the rise , proliferating , spreading