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A doorstep is the step right outside a door, the flat surface you stand on just before going in. People often say something is "on your doorstep" to mean it is very close to home, like "the war was happening right on their doorstep." Some places also still offer "doorstep delivery," meaning something like milk or a parcel is left right at your front door.
門前台階；（比喻）家門口、近在咫尺
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
doorstepnoun/ˈdɔː(ɹ)stɛp/
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architectureAn outside step leading up to the door of a building, usually a home.
- Ailie was standing by the doorstep as he came down the road, and her heart stood still with joy.
- With a little manœuvring they contrived to meet on the doorstep which was […] in a boiling stream of passers-by, hurrying business people speeding past in a flurry of fumes and dust in the bright haze.
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One's immediate neighborhood or locality.
- They want to build the prison right on our doorstep; it will only be half a mile away and being that close scares me.
- As a Hitchin signalman once pointed out to me, when a regulating quandary arises concerning a fast-moving Class A train there is no time to consult Control and get their answer before the express is on one's doorstep.
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informalA thick slice, especially of bread.
- I cut myself a doorstep of bread with masses of butter and went along to see Romanov while I was eating it.
doorstepverb/ˈdɔː(ɹ)stɛp/
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To visit one household after another to solicit sales, charitable donations, political support, etc.
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journalismmediaTo corner somebody for an unexpected interview.
- Throughout her time in journalism, she doorstepped politicians, the child of a politician, crime victims, armed robbers, murderers, suspected murderers...
- Surprisingly few people refused to talk, even those I doorstepped or telephoned out of the blue.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。