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口が重い / くちがおもい : exp 1）incommunicative 2）taciturn
口が堅い / くちがかたい : exp 1）tight-lipped 2）able to keep a secret
口が多い / くちがおおい : exp 1 1）talkative 2）loquacious 3）garrulous 4）voluble exp 2 5）having a large family to support 6）having too many mouths to feed
口が巧い / くちがうまい : exp 1）honeymouthed 2）glib 3）fair-spoken 4）cajoling 5）talking glibly
口が悪い / くちがわるい : exp 1）sarcastic 2）having a sharp (nasty) tongue
口が煩い / くちがうるさい : exp 1 1）rumouring 2）gossiping 2 3）nagging 4）faultfinding
口が軽い / くちがかるい : exp 1）having a loose tongue 2）being talkative 3）speaking without thinking
口の堅い / くちのかたい : 1）(adj-i) tight-lipped
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口が重い

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