Tension or tautness (the state of being stretched or under tension, e.g., a string or muscle).
ギターの弦の張りを調整して音程を合わせた。
I adjusted the tension of the guitar strings to tune them.
最近、肩に張りがあってマッサージに行った。
Lately I've had tension in my shoulders and went for a massage.
Resilience or springiness (e.g., firmness of skin, body of hair); often written in katakana as ハリ.
この美容液を使ってから肌にハリが出てきた。
Since using this serum my skin has regained firmness.
年齢とともに髪の張りが失われることがある。
As people age, hair can lose its springiness.
Willpower, spirit, or a sense of purpose — the energetic enthusiasm or pride one shows.
新人は仕事に張りがあって頼もしい。
The newcomer shows enthusiasm for the work and is promising.
試合に負けてから彼の張りが少しなくなったようだ。
Since losing the match he seems to have lost some of his spirit.