leaky
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leaky
Having a spot or leak through which a liquid or gas can unintentionally enter or escape.
Das Dach ist undicht, bei starkem Regen tropft es ins Wohnzimmer.
The roof is leaky; when it rains heavily, water drips into the living room.
loose-lipped
Colloquial for a person who cannot keep secrets to themselves and passes on information.
Erzähl ihm bloß nichts, der ist total undicht und plaudert alles aus.
Don't tell him anything, he's totally loose-lipped and blabs everything.
The word consists of the prefix 'un-', which expresses negation, and the adjective 'dicht' (tight/sealed), which means 'firmly closed' or 'sealed'. So 'undicht' literally means 'not tight' or 'not sealed'.
Bitte schließe die Flasche richtig, sonst ist sie undicht.
Please close the bottle properly, otherwise it will leak.
In its literal meaning, 'undicht' (leaky) often describes containers or barriers. Typical things that can be leaky are a roof, a tire, a window, a pipe, or a water bottle.
Mein Fahrradreifen ist undicht und verliert ständig Luft.
My bicycle tire is leaky and keeps losing air.
Describing a person as 'undicht' (loose-lipped) is a metaphor and belongs to colloquial speech. It implies that the person cannot keep information to themselves, just as a leaky container cannot hold liquid.
Ich erzähle ihr keine Geheimnisse mehr, sie ist leider total undicht.
I don't tell her secrets anymore; unfortunately, she's totally loose-lipped.
leak
Both words can refer to a leaky spot through which liquid or gas escapes. “Das Leak” is a rare Anglicism in German, while “undicht” is an adjective that describes a spot or an object. In normal German usage, “undicht” is usually more natural.
Das alte Wasserrohr war undicht und ließ langsam Wasser in den Keller laufen.
The old water pipe was leaky and slowly let water into the basement.
Das Leak im alten Wasserrohr ließ langsam Wasser in den Keller laufen.
The leak in the old water pipe slowly let water into the basement.
