noun which may take the genitive case particle 'no', na-adjective
jam-packed; packed like sardines
Describes a space, container, or schedule that is extremely crowded or tightly filled, often uncomfortably so. Used both literally and figuratively.
朝の通勤電車はぎゅうぎゅう詰めだ。
The morning commuter train is jam-packed.
スーツケースに服をぎゅうぎゅう詰めにした
I packed my clothes tightly into the suitcase.