We hanged
talah (taw-law')
to suspend (especially to gibbet) -- hang (up).
our harps
kinnowr (kin-nore')
a harp -- harp.
upon the willows
`arab (aw-rawb')
a willow (from the use of osiers as wattles) -- willow.
in the midst
tavek (taw'-vek)
a bisection, i.e. (by implication) the centre -- among(-st), between, half, (there-,where-), in(-to), middle, mid(-night), midst (among), out (of), through, with(-in).
thereof
