eating between meals; snacking
Refers to the act of eating something between regular meals, often as a light snack.
間食いは太る原因になる。
Snacking between meals can cause weight gain.
彼は間食いが多くて、昼ごはんが食べられなかった。
He snacked so much that he couldn't eat lunch.
Compound of 間 (あいだ, 'interval, between') and 食い (ぐい, the nominalized form of 食う, 'to eat'). The reading ぐい is a rendaku form of くい.