C. F. Keil and Franz Delitzsch on Song of Solomon 2:6

Sol 2:6 6 His left hand is under my head,    And his right hand doth embrace me.

With his left hand he supports her head that had fallen backwards, and with his right he embraces her [herzet], as Luther rightly renders it (as he also renders the name Habakkuk by “der Herzer” = the embracer); for חבּק signifies properly to enfold, to embrace; but then generally, to embrace lovingly, to fondle, of that gentle stroking with the hand elsewhere denoted by חלּה, mulcere. The situation here is like that at Gen 29:13; Gen 48:10; where, connected with the dat., it is meant of loving arms stretched out to embrace. If this sympathetic, gentle embracing exercises a soothing influence on her, overcome by the power of her emotions; so love mutually kindled now celebrates the first hour of delighted enjoyment, and the happy Shulamith calls to those who are witnesses of her joy: