swamp
bits.tsah denotes a wet, reed-associated area, pictured as a place where reeds grow or lie and as an unhealed salt-bound tract.
The attested use denotes a wet area associated with reeds: it is where reeds can grow in Job 8:11 and where one lies among reeds in Job 40:21; Ezekiel 47:11 places it among areas not healed and given to salt.
Senses in use
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Wet reed-associated ground · dominant
In Job 8:11, the absolute singular form occurs in the question of whether a reed can rise where such a wet area is absent; the APB renders the clause "Can the reed rise up where there is no swamp." In Job 40:21, the same absolute singular form names the setting among reeds where he lies down, while Ezekiel 47:11 uses construct singular forms for areas that are not healed and are given to salt.
In the Anselm Project Bible: The APB presents the term as "swamp" in Job 8:11 and Job 40:21, and pairs "swamps" with "marshes" in Ezekiel 47:11. That pairing does not establish a separate meaning for the lemma.