to make stronger; give strength to.

Phonetics . to change (a speech sound) to an articulation requiring more effort, as from fricative to stop or nongeminate to geminate.

to gain strength; grow stronger.

verb

break down , hurt , weaken , discourage , dishearten , dissuade

verb

add , add fuel to fire , anneal , ascend , bolster , brace , build up , buttress , confirm , corroborate , empower , enhance , enlarge , establish , extend , fortify , harden , heighten , increase , intensify , invigorate , justify , make firm , mount , multiply , regenerate , reinforce , rejuvenate , renew , restore , rise , set up , sinew * , steel , step up , substantiate , support , sustain , temper , tone , tone up , toughen , wax * , animate , back , back up , bear out , bloom , brace up , burgeon , carry weight , cheer , consolidate , embolden , enhearten , enliven , flourish , flower , gather resources , gird , give weight , inspirit , nerve , nourish , prepare , prosper , rally , ready , refresh , thrive , uphold , forearm , beef , bind , encourage , endure , energize , help , improve , prop , revitalize , stabilize