捱 (āi) is a variant of 挨 in a specific sense — it means 'to endure' or 'to suffer through' something unpleasant or painful, like hardship or illness, and also 'to delay/drag on' time. It's a written or literary verb, less common than 挨 in modern speech. You'll see it in phrases like 捱饿 ('go hungry'), 捱打 ('take a beating'), and 捱日子 ('drag through the days').