This is the 4837th most frequent Japanese word.
減る
To decrease.
In this sentence, "減る" is used to describe a decrease in quantity or number, specifically referring to weight, indicating a change over a period of time.
私の体重は最近減りました。
My weight has recently decreased.
Here, "減る" reflects a reduction in the amount of water, emphasizing the importance of conservation before the amount becomes critically low.
水が減っているので、節約しましょう。
Water is decreasing, so let's conserve it.
In this example, "減る" demonstrates a decline in number, specifically the participants, affecting the feasibility or outcome of a situation.