Psalm 48:6 New English Translation

⁶Look at them shake uncontrollably,^[a]
like a woman writhing in childbirth.^[b]

Psalm 48:6 tn Heb “trembling seizes them there.” The adverb שָׁם (sham, “there”) is used here, as often in poetic texts, to point “to a spot in which a scene is localized vividly in the imagination” (BDB 1027 s.v.).
Psalm 48:6 tn Heb “[with] writhing like one giving birth.”sn The language of vv. 5-6 is reminiscent of Exod 15:15.

New English Translation (NET)