This is the 7496th most frequent Russian word.
децла
A very small amount; a tiny bit.
Here, 'децла' is used colloquially to mean 'a little bit' to refer to a small amount of tea.
Я выпил децла чая перед выходом.
I drank a little tea before going out.
In this sentence, 'децла' implies a small degree or slight difference, suggesting a minor change in brightness.
В комнате было децла темнее, чем в коридоре.
The room was a tad dimmer than the hallway.
This usage of 'децла' indicates a short duration of time, emphasizing a minor or brief wait.