To Increase

1. (intransitive) (of a quantity, etc.) To become larger or greater.
2. (transitive) To make (a quantity, etc.) larger.
3. To multiply by the production of young; to be fertile, fruitful, or prolific.
4. (astronomy, intransitive) To become more nearly full; to show more of the surface; to wax.

Synonyms

• (become larger): wax, go up, grow, rise, soar(rapidly), shoot up (rapidly)
• (make larger): increment, raise, up(informal); augment
• (multiply by production of young): proliferate, propagate, teem
• (to show more of the surface): wax

Antonyms

• (become larger): decrease, drop, fall, go down, plummet (rapidly), plunge (rapidly), reduce, shrink, sink; decrease
• (make larger): cut, decrease, decrement, lower, reduce; diminish
• (multiply by production of young):
• (to show more of the surface): wane