Eating while standing, or an eatery where customers eat standing up (e.g., standing soba stalls); a quick form of dining.
朝は駅のホームで立ち食いそばを食べることが多い。
In the mornings I often eat standing soba on the station platform.
立ち食いの店は回転が早く値段も安い。
Standing-eating shops have quick turnover and cheap prices.
ランチは忙しくて立ち食いで済ませた。
I was busy so I just had a quick standing meal for lunch.