good crop; bumper harvest
Used in farming contexts to describe a year or season when the harvest is particularly good.
今年は作当たりで、米がたくさんとれた。
This year was a bumper harvest, and we got a lot of rice.
Compound of 作 (saku, 'crop' or 'harvest') and 当たり (atari, 'hit' or 'success'), literally meaning 'a hit in the harvest'.