| 单词 | mum informal |
| 例句 | mum1 informal adjective •he was keeping mum:silent, quiet, mute, dumb, tight-lipped, unforthcoming, reticent. PHRASES mum's the word informal •remember, when we get back to the house, mum's the word:say nothing, keep quiet, don't breathe a word, don't tell a soul, keep it secret, keep it to yourself, keep it under your hat | informal don't let on, don't let the cat out of the bag. |
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