が減る

また客が減るな

There go the customers again.

— タクシー運転手 約束は海を越えて (2017)

ああいう時はな焦らずに店員が減るのをずっと待つのがコツなんだよ

In situations like that, the trick is to stay calm and wait until there are fewer staff around.

— 万引き家族 (2018)

結婚すれば、自由な時間が減るでしょう。

If you get married, you'll probably have less free time.

遊びが増えれば勉強する時間が減ることになるだろう。

If you spend more time having fun, you'll probably have less time to study.