The authorized version also called the king james bible has its own built in dictionary.
In fact the kjv is the english language.
Words are often defined in the same verse. Look especially at the first occurrence of the word. Or in the same chapter.
Therefore word studies and phrase studies can be helpful to understand the kjv phrases and words.
You can do word studies using swordsearcher for windows
or using Tecarta bible for IOS
unbound bible for MAC
or if you want to not use a computer you can use strongs dictionary to find all occurrences of a word. Then you dont look at the greek and hebrew you only look at all the verses that contain the word.
Or you can use Cruden's complete concordance to the old and new testaments instead of strongs. It can be used to find all occurrences of a phrase in the kjv
Just reading the kjv is fine too. Especially if reading it from the beginning since words are generally defined the first time they are used in the kjv.