shut, close, obstruct, block up
閇 centers on closing or blocking an opening: shutting a door, obstructing a passage, or sealing something off.
閇 is a rare variant of 閉, combining 門 (gate) with 下 (down), suggesting a gate being pushed down to close or block.
A gate 門 with a bar 下 lowered down across it: the gate is shut and the way is blocked.
For ヘイ, imagine a heavy gate closing with a loud 'hey!' as someone shouts to stop it: hey -> ヘイ, and the gate is shut.
ceremony performed by a sorcerer to protect a noble setting out on a trip