noun
Physical looseness or slack in a rope, cable, skin, or other material. Often used for sagging skin or a slack line.
ロープのたるみを取ってください。
Please take up the slack in the rope.
年を取ると肌にたるみが出る。
As you age, your skin develops sagginess.
noun
A feeling of mental slackness, boredom, or lack of tension; a letdown after excitement or a period of low motivation.
連休が終わって、気持ちにたるみが出てきた。
After the long holiday, I started to feel a sense of letdown.
仕事にたるみが見られる。
There is a noticeable slackness in the work.
Derived from the verb たるむ (to slacken, sag). The kanji 弛 is used for its meaning of slackening or relaxing, but the word is usually written in kana.