verb
(intransitive) To become hard.
(transitive, ergative) To make something hard or harder.
(transitive, figurative) To strengthen.
(transitive, computing) To modify (a website or other system) to make it resistant to malicious attacks.
(ambitransitive) To become or make (a person or thing) resistant or less sensitive.
(intransitive, informal) To get an erection.
(ambitransitive, phonology) To become or make (a consonant) more fortis; to (cause to) undergo fortition.
(Slavic phonology) To unpalatalize or velarize.
noun
Alternative form of hurden (“coarse linen”).