Sift the Thistles
Fill the sieve with thistles, then sift the thistles in the sieve.
Notice the sounds
Contrast /θ/ at the start of thistles with /s/ in sieve and sift. The written t in thistles is silent; sieve rhymes with give.
Words in this expression
Source
Delight and Power in Speech, Leonard G. Nattkemper and George Wharton James (1919), articulation exercisesPublic domain in the United States; the pinned source includes the Project Gutenberg license.