to let in
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to let in
To allow someone or something to enter a place; to grant someone entry.
Der Türsteher wollte uns nicht in den Club reinlassen, weil er schon zu voll war.
The bouncer didn't want to let us into the club because it was already too full.
'Reinlassen' (to let in) is a separable verb. The prefix 'rein-' goes at the end in a main clause. In the infinitive with 'zu', 'reinzulassen' is written as one word.
Lass den Hund bitte nicht ins Wohnzimmer rein.
Please don't let the dog into the living room.
The verb is made up of 'rein' and 'lassen' (to let). 'Rein' is a colloquial short form of 'herein' and indicates direction: into a place.
Können Sie mich kurz reinlassen? Ich habe meinen Schlüssel vergessen.
Can you let me in for a moment? I forgot my key.
The person or thing that is allowed to enter is always in the accusative.
Die Katze miaut, weil sie niemand reinlässt.
The cat is meowing because no one is letting it in.
'Reinlassen' (to let in) is a typical word in spoken language and informal written communication.
Lass mal frische Luft rein, es ist stickig hier drin.
Let some fresh air in, it's stuffy in here.
to allow / admit / keep closed
'zulassen' and 'reinlassen' can both mean that someone is allowed to go somewhere. 'reinlassen' is concrete: a person or animal is allowed to enter a room, a house, or a site. It sounds everyday and has to do with a place. 'zulassen' is more general and often more official. You can allow people, applicants, or certain actions. The words are easy to confuse when entry is involved. For a door or entrance, 'reinlassen' is usually the better fit; for permission or a rule, 'zulassen' is more likely.
Vor dem Konzert lässt der Sicherheitsdienst die Gäste erst ab acht Uhr rein.
Before the concert, security only lets the guests in from eight o'clock onward.
Die Bibliothek lässt nur angemeldete Besucher zur Veranstaltung zu.
The library only admits registered visitors to the event.