thief, thieves

Idioms  

1. see it takes one to know one (a thief to catch a thief); thick as thieves.

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Example Sentences

Some nouns ending in f or fe change those terminations to ve in the plural, as beef——beeves, leaf——leaves, knife——knives, loaf——loaves, life——lives, wife——wives, thief——thieves, wolf——wolves, self——selves, shelf——shelves, calf——calves, half——halves, elf——elves, sheaf——sheaves.

From Project Gutenberg

—I have several reasons for believing that it is not a thief; thieves take more precautions; this one walked heavily in my asparagus-bed.

From Project Gutenberg