One who wears a mask; one who appears in disguise at a masquerade or wears a mask in a ritual.

That which masks (noise in a signal, etc.).

(transitive, now chiefly dialectal) To render giddy or senseless

(intransitive, now chiefly dialectal) To be bewildered.

(transitive, now chiefly dialectal) To choke; stifle.

(transitive, now chiefly dialectal) To decay; rust.