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| teach grandmother | |||
| teach a cock to crow; teach a dog to bark; teach a hen to cluck; teach a serpent to hiss | |||
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| teach one's grandmother to suck eggs | |||
| учить учёного: 23 phrases in 6 subjects |
| British usage, not spelling | 1 |
| General | 4 |
| Idiomatic | 1 |
| Informal | 3 |
| Proverb | 12 |
| Slang | 2 |