Definition of gleans:
(v) :
(transitive) (figurative) To gather (something, now chiefly something intangible such as experience or information) in small amounts over a period of time, often with some difficulty; to scrape together.
(v) :
(transitive) To collect (fruit, grain, or other produce) from a field, an orchard, etc., after the main gathering or harvest.
(v) :
(transitive) To collect fruit, grain, or other produce from (a field, an orchard, etc.), after the main gathering or harvest.
(v) :
(intransitive) To collect fruit, grain, or other produce after the main gathering or harvest.
(v) :
(transitive) (figurative) To take away (someone's) possessions; to strip (someone) bare.
(v) :
(transitive) (figurative) (zoology) Of an animal, especially a bat or a bird: to feed by picking up or plucking (prey, mainly arthropods such as insects) from various places.