לצבות בטן is the same as לְהַצְבּוֹת בטן (the verb being the Hiphil infinitive). This is the usage of the Patach: that the “lamed” has it as its vowel instead of the ה having it (viz., that it is a contraction of לה). Similar is (Exodus 13:21) לַרְאת...
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