“Strapped to his right thigh”
Now Ehud had made for himself a double-edged sword a cubit long. He strapped it to his right thigh under his cloak… And Ehud reached with his left hand, pulled the sword from his right thigh, and plunged it into Eglon's belly. (Judges 3:16, 21 BSB)
What it sounds like today
A minor note about which leg the assassin's dagger was on.
The cultural key
The placement is the whole trick. A right-handed man wears his sword on the left thigh and draws across his body, so guards frisking a visitor patted down the left side. Ehud, being left-handed, strapped his short blade on the unsearched right thigh and walked in armed to assassinate the Moabite king. The detail carries a quiet irony: Ehud is a Benjamite, and 'Benjamin' means 'son of the right hand,' yet his clan was famous for producing crack left-handed warriors (Judges 20:16). A concealed weapon on the wrong side undoes an empire.
Recovered meaning
Ehud's left-handedness lets him hide the blade where no guard would check, turning a supposed disadvantage into the weapon of deliverance. The son of the right hand strikes with his left.