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Difference between Have a swelled head and Have a thick head

have a swelled head—(also: have a big head) have an exaggerated opinion of oneself; be self-conceited:

  • Everybody over forty is tired and down and out, and everybody under thirty has swelled head.

have a thick head—(coll.)

1. be dull of intellect:

  • You could have worked that out for yourselves if you hadn’t such thick heads.

2. have an aching head (suffering from a hangover):

  • No more brandy, thanks. I’ll have a thick enough head as it is.