Denshi Jisho — Online Japanese dictionary

Found 4 sentences.

スイカ出盛り Watermelons are in season now.
キュウリスイカ親戚 Cucumbers are related to watermelons.
こんな大きなスイカ見たことない I've never seen such a giant watermelon!
季節スイカ入れる容易ない。 It's not easy to come by watermelons at this time of year.