Strong’s Hebrew
H3854 — lahag
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
לַהַג
lahag — pronounced lah'-hag
from an unused root meaning to be eager; intense mental application:--study.
1 occurrence in the KJV.
Ecclesiastes 12:12
And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh.