Brewer's: Siccis pedibus
[with dry feet]. Metaphorically, without notice.
“It may be worth noticing that both Mrs. Shelley and Mr. Rossetti pass over the line siccis pedibus.”- Notes and Queries (26th May, 1893, p. 417).
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894