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| Russian | English |
| быть крепким орешком | be a tougher nut to crack (for ... – для ... ; Fox News Alex_Odeychuk) |
| оказаться крепким орешком | be a tougher nut to crack (for ... – для ... ; Fox News Alex_Odeychuk) |
| физически крепкий | as tough as old boots (sea holly) |