gleaning
le.qet denotes what is left in a harvest and is not to be gathered.
The attested use concerns what remains from a harvest: both verses prohibit gathering it after reaping the field, and Leviticus 23:22 directs that what is left be left for the afflicted and the sojourner.
Senses in use
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Harvest remains left ungathered · dominant
In Leviticus 19:9, the construct singular noun occurs in the prohibition against gathering what remains from the harvest after the field's edge is not fully reaped. In Leviticus 23:22, the same form occurs in the parallel command not to gather it, followed by the instruction to leave them for the afflicted and the sojourner.
In the Anselm Project Bible: The APB presents the noun within the phrase “the gleaning of your harvest” in both verses. That phrase confirms the harvest setting but does not isolate every aspect of the noun's contribution.