Suck dry is a phrase that refers to completely depleting or draining something or someone of their resources or energy. Some antonyms for this phrase could include replenish, refresh, rejuvenate, revive, or invigorate. These words all suggest bringing back energy, strength, or vitality to something that was previously lacking. Another set of antonyms for suck dry could be conserve, retain, save, or preserve. These terms suggest protecting and maintaining resources or energy, rather than depleting them. Overall, the opposite of suck dry is to nourish, sustain, and care for something rather than exhaust it.