(chiefly in passive) To overtake (a traveller etc) with the darkness of night, especially before shelter is reached.
To darken; to shroud or obscure.
To plunge or be overwhelmed in moral or intellectual darkness.
Overtaken by night; especially of a traveller, etc.: caught out by oncoming night before reaching one's destination.
Plunged into darkness.
Lacking education or knowledge; unenlightened; also, lacking morality; immoral, unscrupulous.
Difficult to understand; abstruse, obscure.