Loins - Vine's Expository Dictionary of New Testament Words
Loins[ 1,,G3751, osphus ]
(a) in the natural sense in Matthew 3:4; Mark 1:6;
(b) as the seat of generative power," Hebrews 7:5, Hebrews 7:10; metaphorically in Acts 2:30;
(1) of girding the "loins" in readiness for active service for the Lord, Luke 12:35;
(2) the same, with truth, Ephesians 6:14, i.e., bracing up oneself so as to maintain perfect sincerity and reality as the counteractive in Christian character against hypocrisy and falsehood;
(3) of girding the "loins" of the mind, 1 Peter 1:13, RV, "girding," suggestive of the alertness necessary for sobriety and for setting one's hope perfectly on "the grace to be brought ... at the revelation of Jesus Christ" (the present participle, "girding," is introductory to the rest of the verse).