[I am / someone is] hungry

to become hungry

belly, tummy, stomach, abdomen

(archaic, possibly obsolete, honorific) a person used as a form of mildly honorific indirect reference to someone / (uncommon) one's mother, specifically one's birth mother

to become empty

have space between, be open / become empty, unoccupied, vacated / become unused, free / become free (not busy) / become open (of a job etc.)

become empty (not crowded; not full) / become free (not busy)

stomach

be available, be not busy

Same as above.