expression, i-adjective
so crowded there's no room to stand; jam-packed; full to capacity
Idiomatic expression literally meaning 'not even room to drive an awl'; used for extremely crowded places or packed schedules.
会場は立錐の余地もないほど混んでいた。
The venue was so crowded there was no room to stand.
彼のスケジュールは立錐の余地もない。
His schedule is jam-packed.