Suspended Sentence
noun, の adjective
Remember how you learned that 猶予 means "extension?" You were supposed to carry out your sentence and go to jail, but the judge gave you a 猶予 (extension). In other words, you've received a suspended sentence.
執行猶予 means you're guilty, but the judge hits the pause button on your prison time. If you stay out of trouble, the prison time gets dismissed. But if you commit another crime, you must serve both the original and new sentence. Basically, you better hope for a suspended sentence!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
あいつは執行猶予期間中に他の刑事事件を起こしたんだよ。
That guy caused other criminal cases during his suspended sentence.