Definitions
1.verb(chiefly in passive) To overtake (a traveller etc) with the darkness of night, especially before shelter is reached.
2.verbTo darken; to shroud or obscure.
3.verbTo plunge or be overwhelmed in moral or intellectual darkness.
4.adjectiveOvertaken by night; especially of a traveller, etc.: caught out by oncoming night before reaching one's destination.
5.adjectivePlunged into darkness.
6.adjectiveLacking education or knowledge; unenlightened; also, lacking morality; immoral, unscrupulous.
7.adjectiveDifficult to understand; abstruse, obscure.