glean, gleaning

Definition:

The term "glean" means to go through a field or orchard and pick up whatever grain or fruit the harvesters have left behind.

God told the Israelites to let the widows, poor people, and foreigners glean the leftover grain in order to provide food for themselves.
Sometimes the owner of the field would allow the gleaners to go directly behind the harvesters to glean, which enabled them to glean much more of the grain.
A clear example of how this worked is in the story of Ruth, who was generously allowed to glean among the harvesters in the fields of her relative Boaz.
Other ways to translate "glean" can be "pick up" or "gather" or "collect."