すし
sushi
JMdict 1595650
寿司(すし)sushiを食(た)べto eatに行(い)こうlet's go
Let's go eat sushi
を (object) marks 寿司(すし) (sushi) as what gets eaten. The verb 食べる(たべる) (eat) drops to its stem and takes に (in order to), the “go in order to do X” pattern, then 行く(いく) (go) shifts to the volitional 行こう(いこう) (let’s go) to suggest doing it together.