To Stress
To Stress Out, To Be Nervous
する verb
緊張 is stress. So, the verb version is to stress out.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
試合前に緊張するのはよくあることです。
It's common to get nervous before a match.
初めてのデートで緊張した。
I was nervous on my first date.
緊張しすぎて、手がふるえました。
I was so nervous that my hands started shaking.
大事なプレゼンなので、とても緊張しています。
I'm very nervous for an important presentation.