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| knock on wood (Юрий Гомон) | |||
| touch wood (4uzhoj) | |||
keep one's balls crossed (Может иметь сексуальную коннотацию  urbandictionary.com VLZ_58) | |||
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| keep your digits crossed (So please keep your fingers (and toes, and any other digits) crossed for us that this works. VLZ_58) | |||