Base Hit
Single
A baseball base hit is a base hit or single in baseball terms. A 二塁打 is a double, a 三塁打 is a triple, and a homerun is something you'll learn here on WaniKani at some point if you haven't already.
るいだ
This is a jukugo word that uses the on'yomi readings of the kanji. You've learned the readings for both of these kanji, so you should be able to read this word already!
彼が塁打を打つのは久しぶりだね。いつもはホームランだからな。
It’s been a long time since he made a base hit. He always hits homeruns.