peacefully, quietly
闟 centers on a state of calm closure: being peaceful and quiet, as if a gate has been gently shut to create stillness.
闟 combines 門 (gate) with 翕, which likely contributes both sound and the idea of closing or gathering. The overall sense of peaceful quiet may derive from a gate being shut to create stillness.
The gate 門 encloses 翕, which looks like feathers 羽 gathered together. Imagine closing a gate to keep a flock of birds calm and quiet inside.
For キュウ, picture a quiet courtyard behind the gate where you hear a soft 'cue' sound: cue -> キュウ, and the scene is peaceful and still.