godan verb (-ru), transitive verb
gnaw; nibble; bite; munch; crunch
Describes biting off small pieces of something hard or tough, such as an apple, a bone, or a pencil. Often implies a repetitive, rodent-like action.
りんごを丸ごとかじる。
I bite into a whole apple.
The dog is gnawing on a bone.
godan verb (-ru), transitive verb
dabble in; have a smattering of; know a little about
Metaphorical extension of the gnawing sense: to have only superficial knowledge of a subject, often used with fields of study or hobbies. Implies a lack of deep commitment.
大学でフランス語を少しかじった。
I dabbled a bit in French at university.
彼はいろんな学問をかじっているが、どれも中途半端だ。
He dabbles in various fields of study, but he hasn't mastered any of them.