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口の堅い / くちのかたい : 1）(adj-i) tight-lipped
口が堅い / くちがかたい : exp 1）tight-lipped 2）able to keep a secret
口の悪い / くちのわるい : 1）(adj-i) sarcastic 2）foulmouthed
口の軽い / くちのかるい : 1）(adj-i) loose-tongued 2）talkative
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
口争い / くちあらそい : n vs 1）quarreling 2）quarrelling
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口の堅い

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