What are the proper ways to say that something gets smaller (decreases in size) in one word?
I am not asking about cases when what we discribe represents a measure of something (price, volume, weight, height). In those cases I know that it is correct to say, for example
- The price decreases
- The volume reduces
I am asking about cases when real material things get smaller.
- A baloon gets smaller (deflates)
- An apple gets smaller (when somebody eats it)
The goal is to replace 'gets smaller' with one word (verb).
Can I in these cases use words such as 'decrease', 'reduce' without adding 'in size'?
What are the most commonly used words or phrases?