緩(ゆる)むto become loose, to slacken (e.g. rope), to become less tense, to relax, to let one's guard down, to slacken (e.g. coldness, supervision), to become lax, to become softer (e.g. ground, facial expression), (of ice) to partially melt, to decrease (e.g. speed), (of a market price) to go down slightly

緩(ゆる)んでしまったネジをしめる。

To tighten a screw that's become loose.

寒(さむ)さが緩(ゆる)んできたのでこたつをしまいました。

Since the cold has become more lax, I put away the kotatsu.

試験(しけん)中(ちゅう)に気(き)が緩(ゆる)むとケアレスミスが多(おお)く発生(はっせい)します。

If you let your guard down during this test, you'll make many careless mistakes.

昨夜(さくや)から降(ふ)り続(つづ)く大雨(おおあめ)のせいで地盤(じばん)が緩(ゆる)んでいるようです。

It seems the ground has become loose due to some heavy rain that’s been falling since last night.

靴(くつ)紐(ひも)が緩(ゆる)んだまま走(はし)れば、近(ちか)いうちに転(ころ)ばずには済(す)まないだろう。

Run with your shoelaces loosened, and you’ll probably trip sooner or later.