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to be late; to be delayed; to fall behind schedule; to be overdue
to fall behind (in a race, one's studies, etc.); to lag behind; to be behind (the times)
to be slow (of a clock or watch)
to be bereaved of; to be preceded by (someone) in death
準備が後れると全体に影響が出る。
If preparations fall behind, it affects everything.
時計が五分後れている。
The clock is five minutes slow.
悪天候で工事の進行が後れた。
The construction progress was delayed due to bad weather.