noun
allotment; arrangement; provision
Refers to the act of allocating or providing something, often with a nuance of temporary or provisional arrangement. Commonly used in the phrase あてがい扶持 (あてがいぶち), meaning a stipend or allowance given as a stopgap.
彼はあてがい扶持でなんとか暮らしている。
He manages to get by on a small allowance.
この部屋はあてがいの宿のようなものだ。
This room is like a temporary lodging provided for me.
支給 refers to official provision or supply, especially of goods or money, whereas あてがい can carry a nuance of something being doled out as a temporary measure.
Derived from the verb あてがう (to allot, to assign). The noun form あてがい is rare and mostly found in fixed expressions.