slowincrease
nounUK /ˈsləʊ.ɪn.kriːs/
US /ˈsloʊ.ɪn.kriːs/
A slow increase is when something gets a little bigger or more, but very slowly.
The slow increase in the puppy's weight showed it was growing healthy and strong.
OTHER MEANINGS
2. A small, gradual addition to an amount over time.
There was a slow increase in the number of books on the shelf each week.
3. A gentle upward change in a level or number.
The slow increase in temperature told us spring was coming.
4. The act of making something grow bit by bit.
The gardener's slow increase of water helped the plants without drowning them.