be in bondage, (do) serve(-ice)

Boyd’s Bible Dictionary:

[SLAVE.]

Strong’s Dictionary of Greek Words:

Number:
1398 (find all occurrences in KJV Bible)
Greek:
δουλεύω
Transliteration:
douleuo
Phonic:
dool-yoo’-o
Meaning:
from 1401; to be a slave to (literal or figurative, involuntary or voluntary)
KJV Usage:
be in bondage, (do) serve(-ice)