To gather information in small amounts, with implied difficulty, bit by bit.
To collect what is left behind (grain, grapes, etc.) after the main harvest or gathering.
To gather what is left in (a field or vineyard).
To frugally accumulate resources from low-yield contexts.
A collection made by gleaning.
To introduce (something) as a reasoned conclusion; to conclude by reasoning or deduction, as from premises or evidence.
To lead to (something) as a consequence; to imply.