intransitive. Of the mind, senses, thoughts, etc.: to be in a whirl, to spin; to be or become giddy or confused.

intransitive. Of the head, mind, etc.: to spin; to experience feelings of giddiness.

Of the head or brain: To be affected with dizziness; to have a giddy sensation. Also, of the head, to swim round = to be in a whirl.

Of the brain or head: To whirl; to be giddy or dazed.